Data analytics can be used to compare data from different sources and identify any discrepancies or anomalies. In this case, comparing a population of loans input in the origination system to loans booked on the servicing system can help detect any errors or frauds in the loan origination process. The other options are not examples of data analytics, but rather controls for data integrity, reconciliation, and error handling. References: CISA Review Manual (Digital Version), Chapter 3, Section 3.3.2

The answer C is correct because preventive maintenance is outsourced to multiple vendors without requiring nondisclosure agreements (NDAs) would be of greatest concern to an IS auditor reviewing on-site preventive maintenance for an organization's business-critical server hardware. This is because outsourcing preventive maintenance to multiple vendors without NDAs exposes the organization to the risk of unauthorized access, disclosure, or modification of sensitive data and information stored on the servers. NDAs are legal contracts that bind the vendors to protect the confidentiality and security of the data and information they access or handle during the preventive maintenance. Without NDAs, the vendors may not have any obligation or incentive to safeguard the data and information, and they may misuse, leak, or compromise them for malicious or commercial purposes. This could result in financial losses, reputational damage, legal liabilities, or regulatory penalties for the organization.
The other options are not as concerning as option C. Preventive maintenance costs exceed the business allocated budget (option A) is a financial issue that may affect the profitability or efficiency of the organization, but it does not directly impact the security or availability of the server hardware. Preventive maintenance has not been approved by the information system (option B) is a procedural issue that may indicate a lack of coordination or communication between the IT department and the business units, but it does not necessarily affect the quality or effectiveness of the preventive maintenance. The preventive maintenance schedule is based on mean time between failures (MTBF) parameters (option D) is a technical issue that may influence the frequency or timing of the preventive maintenance, but it does not imply any risk or deficiency in the preventive maintenance itself.
References:
* What is a Maintenance Audit?
* How to audit your preventative maintenance schedule
* 5 Step Maintenance Management Program Audit
* How do you get effective Preventive Maintenance really?
* What is a Planned Preventative Maintenance Audit?

This is the most helpful method for measuring benefits realization for a new system, because it involves evaluating the actual outcomes and impacts of the system after it has been implemented and used for a certain period of time. A post-implementation review can compare the actual benefits with the expected benefits that were defined in the business case or the benefits realization plan, and identify any gaps, issues, or opportunities for improvement. A post-implementation review can also assess the effectiveness, efficiency, and satisfaction of the system's users, stakeholders, and customers, and provide feedback and recommendations for future enhancements or changes.
The other options are not as helpful as post-implementation review for measuring benefits realization for a new system:
* Function point analysis. This is a technique that measures the size and complexity of a software system based on the number and types of functions it provides. Function point analysiscan help estimate the cost, effort, and time required to develop, maintain, or enhance a software system, but it does not measure the actual benefits or value that the system delivers to the organization or its users.
* Balanced scorecard review. This is a strategic management tool that measures the performance of an organization or a business unit based on four perspectives: financial, customer, internal process, and learning and growth. A balanced scorecard review can help align the organization's vision, mission, and goals with its activities and outcomes, but it does not measure the specific benefits or impacts of a new system.
* Business impact analysis (BIA). This is a process that identifies and evaluates the potential effects of a disruption or disaster on the organization's critical business functions and processes. A BIA can help determine the recovery priorities, objectives, and strategies for the organization in case of an emergency, but it does not measure the benefits or value of a new system.

The most helpful thing for an IS auditor to review when evaluating an organization's business processes that are supported by applications and IT systems is the enterprise architecture (EA). EA is the practice of designing a business with a holistic view, considering all of its parts and how they interact. EA defines the overall goals, the strategies that support those goals, and the tactics that are needed to execute those strategies.
EA also outlines the ways various components of IT projects interact with one another and with the business processes. By reviewing the EA, an IS auditor can gain a comprehensive understanding of how the organization aligns its IT efforts with its overall mission, business strategy, and priorities. An IS auditor can also assess the effectiveness, efficiency, agility, and continuity of complex business operations.
The other options are not as helpful as option B. A configuration management database (CMDB) is a database that stores and manages information about the components that make up an IT system. A CMDB tracks individual configuration items (CIs), such as hardware, software, or data assets, and their attributes, dependencies, and changes over time. A CMDB can help an IS auditor to monitor the performance, availability, and configuration of IT assets, but it does not provide a holistic view of how they support the business processes. IT portfolio management is the practice of managing IT investments, projects, and activities as a portfolio. IT portfolio management aims to optimize the value, risk, and cost of IT initiatives and align them with the business objectives. IT portfolio management can help an IS auditor to evaluate the return on IT investments and the alignment of IT projects with the business strategy, but it does not provide a detailed view of how they support the business processes. IT service management (ITSM) is the practice of planning, implementing, managing, and optimizing IT services to meet the needs of end users and customers.
ITSM focuses on delivering IT as a service using standardized processes and best practices. ITSM can help an IS auditor to review the quality, efficiency, and effectiveness of IT service delivery and support, but it does not provide a comprehensive view of how they support the business processes. References: What is enterprise architecture (EA)? - RingCentral, What is a configuration management database (CMDB)? - Red Hat, IT Portfolio Management Strategies | Smartsheet, What is IT service management (ITSM)? | IBM