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ISACA Certified Information Systems Auditor · Isaca
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I think A is correct
Increased cost of maintenance (Option C): While a valid concern, it's often a secondary consequence compared to the immediate security risk posed by zero-day vulnerabilities. Database updates (Option B): Depending on the specific architecture, database updates might still be possible even on an unsupported OS. However, it doesn't mitigate the security risks associated with the underlying operating system itself. License issues (Option D): While using unsupported software might violate license agreements, the immediate security risk posed by zero-day vulnerabilities is a more critical concern for an IS auditor.
A. Potential exploitation of zero-day vulnerabilities in the system