When an employee exploits avulnerability, the most appropriate audit is aforensic audit, as it focuses oninvestigating and documenting security incidentsfor legal or disciplinary action.
Option A (Incorrect):Acompliance auditensures adherence to policies but does not investigate incidents in detail.
Option B (Incorrect):Application security testinghelps identify vulnerabilities but does not addressemployee misuse.
Option C (Correct):Aforensic auditgathersdigital evidence, determines how the exploit occurred, and ensures legal compliance in the investigation.
Option D (Incorrect):Penetration testingidentifies weaknesses but does notanalyze past incidents.
Reference:ISACA CISA Review Manual -Domain 5: Protection of Information Assets- Covers forensic investigations, digital evidence collection, and security incident response.

Thebiggest riskin cloud migration isdata security, especially unauthorized access by the cloud provider.
Option A (Correct):The cloud providermanages and stores organizational data, meaning that abreach, insider threat, or improper accessposes amajor risk. Properencryption and access controlsare critical.
Option B (Incorrect):Whilemulti-tenancy risks exist, cloud providers typically implement strongisolation mechanismsbetween clients.
Option C (Incorrect):Increased dependency on the provider is aconcern, but the impact depends onservice agreements and redundancy measures.
Option D (Incorrect):Limiting the right to audit is acompliance issue, butdata security risksare more critical.
Reference:ISACA CISA Review Manual -Domain 5: Protection of Information Assets- Covers cloud computing risks and security considerations.

Using risk assessments to determine areas to be included in an audit plan is a primary benefit because it helps to prioritize the audit activities based on the level of risk and the potential impact of the audit findings. This way, the audit resources, such as time, staff, and budget, can be allocated more efficiently and effectively to the areas that need the most attention and provide the most value.
References
ISACA CISA Review Manual, 27th Edition, page 256
What is the Purpose of a Risk Assessment?
Mastering the Process of Risk Assessment

The best answer is C. Insufficient due diligence performed on the vendor.
ISACA guidance on third-party and cloud risk repeatedly emphasizes the need for thorough vendor due diligence before entering or expanding a business relationship. When confidential backups are being migrated to a cloud solution, insufficient due diligence is the greatest concern because it can expose the organization to security, privacy, resilience, and compliance failures across the whole service arrangement.
Option A is relevant for retired media handling, but it is narrower than the overall third-party risk. Option B affects performance and growth, not necessarily confidentiality. Option D is a business issue, but not the greatest audit concern when confidential data is involved. Vendor due diligence is the most important control at this stage.
References (Official ISACA):
* ISACA, The Top 5 Cybersecurity Threats and How to Defend Against Them.
* ISACA Journal, The Encrypted Truth Is Already Out There.