Reviewing the application implementation documents is the best way for an IS auditor to assess the design of an automated application control. An automated application control is a control that is embedded in the application software and is executed by the system without human intervention. An automated application control is designed to ensure the accuracy, completeness, validity, and authorization of transactions and data processed by the application. Examples of automated application controls are input validation, edit checks, calculations, reconciliations, and exception reports.
The application implementation documents are the documents that describe the design specifications, logic, and functionality of the application and its controls. The application implementation documents may include:
Business requirements document - a document that defines the business objectives, needs, and expectations of the application.
Functional specifications document - a document that describes the features, functions, and interfaces of the application and its controls.
Technical specifications document - a document that details the technical architecture, design, and configuration of the application and its controls.
Test plan and test cases - a document that outlines the testing strategy, methodology, and scenarios for verifying the functionality and performance of the application and its controls.
User manual and training material - a document that provides instructions and guidance on how to use the application and its controls.
By reviewing the application implementation documents, an IS auditor can:
Gain an understanding of the purpose, scope, and nature of the application and its controls.
Evaluate whether the application and its controls are designed to meet the business requirements and objectives.
Identify any gaps, inconsistencies, or errors in the design of the application and its controls.
Compare the design of the application and its controls with the best practices and standards in the industry.
Determine whether the application and its controls are adequately tested and documented.
Interviewing the application developer is not the best way for an IS auditor to assess the design of an automated application control. An interview is a verbal communication technique that involves asking questions and listening to responses. An interview can be useful for obtaining general information or clarifying specific issues related to the application and its controls. However, an interview alone cannot provide sufficient evidence or documentation to support the auditor's assessment of the design of an automated application control. An interview may also be subject to bias, misunderstanding, or misinterpretation by either party.
Obtaining management attestation and sign-off is not the best way for an IS auditor to assess the design of an automated application control. Management attestation and sign-off is a formal process that involves obtaining written confirmation from management that they have reviewed and approved the design of the application and its controls. Management attestation and sign-off can indicate management's commitment and accountability for the quality and effectiveness of the application and its controls. However, management attestation and sign-off cannot substitute for an independent and objective evaluation by an IS auditor.
Management attestation and sign-off may also be influenced by pressure, conflict of interest, or fraud.
Reviewing system configuration parameters and output is not the best way for an IS auditor to assess the design of an automated application control. System configuration parameters are settings that define how the system operates or interacts with other components. System output is data or information that is produced by the system as a result of processing transactions or performing functions. Reviewing system configuration parameters and output can help an IS auditor to verify whether the system is configured correctly and whether it produces accurate and reliable output. However, reviewing system configuration parameters and output cannot provide a comprehensive view of how the application and its controls are designed to achieve their objectives. Reviewing system configuration parameters and output may also require technical expertise or access rights that may not be available to an IS auditor.

This should result in a finding because it violates the best practice of setting rules for groups rather than users. According to one of the web search results1, using group permissions instead of individual permissions can simplify the management and maintenance of ACLs, reduce the risk of human errors, and ensure consistency and compliance. Individual permissions can create conflicts, confusion, and security gaps in the ACLs. Therefore, the IS auditor should report this as a finding and recommend using group permissions instead.

The best way to sanitize a hard disk for reuse to ensure the organization's information cannot be accessed is data wiping. Data wiping is a process that overwrites the data on the hard disk with random or meaningless patterns, making it unrecoverable by any software or hardware methods. Data wiping can provide a high level of security and assurance that the organization's information is permanently erased from the hard disk, and that it cannot be accessed by unauthorized parties or malicious actors.
Re-partitioning is not a way to sanitize a hard disk for reuse, but rather a way to organize the hard disk into different logical sections or volumes. Re-partitioning does not erase the data on the hard disk, but only changes the structure and allocation of the disk space. Re-partitioning may make the data inaccessible to the operating system, but not to other tools or methods that can scan or recover the data from the disk sectors.
Degaussing is a way to sanitize a hard disk for reuse, but only for magnetic hard disks, not solid state drives (SSDs). Degaussing is a process that exposes the hard disk to a strong magnetic field, which disrupts and destroys the magnetic alignment of the data on the disk platters. Degaussing can effectively erase the data on magnetic hard disks, but it can also damage or render unusable the electronic components of the hard disk, such as the read/write heads or circuit boards. Degaussing also does not work on SSDs, which store data using flash memory cells, not magnetic media.
Formatting is not a way to sanitize a hard disk for reuse, but rather a way to prepare the hard disk for use by an operating system. Formatting is a process that creates a file system on the hard disk, which defines how the data is stored and accessed on the disk. Formatting does not erase the dataon the hard disk, but only deletes the file system metadata and marks the disk space as available for new data. Formatting may make the data invisible to the operating system, but not to other tools or methods that can restore or recover the data from the disk sectors.
References:
How to Wipe A Hard Drive for Reuse? Check the Quickest Way to Wipe A Hard Drive - EaseUS 1 HP PCs - Using Secure Erase or HP Disk Sanitizer 2 HOW to QUICKLY and PERMANENTLY SANITIZE ANY DRIVE (SSD, USB thumb drive ...)

The best way for the auditor to address this issue is to verify management has approved a policy exception to accept the risk. A policy exception is a formal authorization that allows a deviation from the established policy requirements for a specific situation or period of time. A policy exception should be based on a risk assessment that evaluates the impact and likelihood of the potential threats and vulnerabilities, as well as the cost and benefit of the alternative controls. A policy exception should also be documented, approved, and monitored by management.
Recommending the application be patched to meet requirements is not the best way for the auditor to address this issue. Patching the application may not be feasible, cost-effective, or timely, given that the application will be decommissioned in three months. Patching the application may also introduce new risks or errors that could affect the functionality or performance of the application.
Informing the IT director of the policy noncompliance is not the best way for the auditor to address this issue.
Informing the IT director of the policy noncompliance may not resolve the issue or mitigate the risk, especially if the IT director is already aware of the situation and has decided to accept it. Informing the IT director of the policy noncompliance may also create unnecessary conflict or tension between the auditor and the auditee.
Taking no action since the application will be decommissioned in three months is not the best way for the auditor to address this issue. Taking no action may expose the organization to significant risks or consequences, such as data breaches, regulatory fines, or reputational damage, if the application is compromised or exploited by malicious actors. Taking no action may also violate the auditor's professional standards and responsibilities, such as due care, objectivity, and reporting.
References:
ISACA, CISA Review Manual, 27th Edition, 2019, p. 289
ISACA, CISA Review Questions, Answers & Explanations Database - 12 Month Subscription Cybersecurity Engineering for Legacy Systems: 6 Recommendations - SEI Blog How to Secure Your Company's Legacy Applications - iCorps