Comprehensive and Detailed Step-by-Step Explanation:Transposition and transcription errors occur when characters or numbers are accidentally swapped or misentered during data entry.
* Option A (Incorrect):Duplicate checks ensure that the same record is not entered twice but do not specifically detect transposition or transcription errors.
* Option B (Incorrect):Completeness checks ensure that all required data is entered but do not validate data accuracy.
* Option C (Incorrect):Sequence checks verify that records follow a logical sequence but do not catch errors within individual data entries.
* Option D (Correct):Acheck digitis an additional number generated through an algorithm (e.g., Luhn algorithm for credit cards) that helps detect errors such as transpositions (e.g., swapping digits 45 # 54) and transcriptions (e.g., mistyping 8 as 3).
Reference:ISACA CISA Review Manual -Domain 3: Information Systems Acquisition, Development, and Implementation- Covers input validation and error detection techniques.

Comprehensive and Detailed Step-by-Step Explanation:
A lack ofMobile Device Management (MDM) enrollmentis the biggest concern, asunmanaged devicespose a serious security risk.
* Not All Devices Enrolled in MDM (Correct Answer - C)
* Unenrolled devices can bypass security policies.
* Example:A stolen, unenrolled device may lack encryption, exposing corporate data.
* Biometric Authentication Required (Incorrect - A)
* Biometrics are anenhanced security measure, not a concern.
* VPN Not Required for Internal Network (Incorrect - B)
* VPNs are typically used for external access, not always needed internally.
* Remote Wipe Requires Internet (Incorrect - D)
* A limitation but stillless riskythan allowing unsecured devices.
References:
* ISACA CISA Review Manual
* NIST 800-124 (Mobile Device Security)

A monitored mantrap at entrance and exit points would be the most effective compensating control in this scenario. A mantrap is a physical security access control system comprising a small space having two sets of interlockingdoors such that the first set of doors must close before the second set opens. By implementing a monitored mantrap, unauthorized access can be prevented and it can ensure that all individuals are logged when they enter and exit the server room12.
References: ISACA's Information Systems Auditor Study Materials3

A demilitarized zone (DMZ) is a network segment that is separated from the internal network and the external network, such as the internet, by firewalls or other security devices. A DMZ provides an extra layer of security for the organization's internal network by isolating the servers and services that need to be accessible to external users, such as a file server, from the rest of the network. A DMZ also prevents external users from accessing the internal network directly, as they have to go through two firewalls to reach it. Therefore, setting up a DMZ is an IS auditor's best recommendation to protect anorganization from attacks when its file server needs to be accessible to external users12.
The other possible options are:
* Enforce a secure tunnel connection: This means that the organization requires external users to establish a secure and encrypted connection, such as a virtual private network (VPN), to access its file server.
This can provide some level of security and privacy for the data transmission, but it does not protect the file server or the internal network from attacks if the connection is compromised or if the external users are malicious. Therefore, enforcing asecuretunnel connection is not an IS auditor's best recommendation to protect an organization from attacks when its file server needs to be accessible to external users3.
* Enhance internal firewalls: This means that the organization improves the security and performance of its internal firewalls, which are devices that filter and control the network traffic between different segments of the network. This can provide some level of protection for the internal network from unauthorized or malicious access, but it does not protect the file server or the external network from attacks if the file server is exposed to the internet or if the external network is compromised. Therefore, enhancing internal firewalls is not an IS auditor's best recommendation to protect an organization from attacks when its file server needs to be accessible to external users4.
* Implement a secure protocol: This means that the organization uses a secure and standardized protocol, such as Secure File Transfer Protocol (SFTP) or Secure Shell (SSH), to transfer files between its file server and external users. This can provide some level of security and integrity for the data transmission, but it does not protect the file server or the internal network from attacks if the protocol is exploited or if the external users are malicious. Therefore, implementing a secure protocol is not an IS auditor's best recommendation to protect an organization from attacks when its file server needs to be accessible to external users5. References: 1: What Is a DMZ Network and Why Would You Use It? | Fortinet 2: Demilitarised zone (DMZ) | Cyber.gov.au 3: What Is VPN Tunneling? | Fortinet 4: Firewall
- Wikipedia 5: Secure Shell - Wikipedia

The most concerning issue when determining if information assets are adequately safeguarded during transport and disposal is lack of appropriate data classification. Data classification is a process that assigns categories or levels of sensitivity to different types of information assets based on their value, criticality, or risk to the organization. Data classification can help safeguard information assets during transport and disposal by providing criteria and guidelines for identifying, labeling, handling, and protecting information assets according to their sensitivity. Lack of appropriate data classification can compromise the security and confidentiality of information assets during transport and disposal by exposing them to unauthorized access, disclosure, theft, damage, or destruction. The other options are not as concerning as lack of appropriate data classification in safeguarding information assets during transport and disposal, as they do not affect the identification, labeling, handling, or protection of information assets according to their sensitivity. Lack of appropriate labeling is a possible factor that may increase the risk of misplacing, losing, or mishandling information assets during transport and disposal, but it does not affect the classification of information assets according to their sensitivity. Lack of recent awareness training is a possible factor that may affect the knowledge or behavior of staff involved in transporting or disposing of information assets, but it does not affect the classification of information assets according to their sensitivity. Lack of password protection is a possible factor that may affect the security or confidentiality of information assets stored on devices during transport and disposal, but it does not affect the classification of information assets according to their sensitivity. References: CISA Review Manual (Digital Version), Chapter 5, Section 5.3.2