正解:D
Validating the authenticity of the patch is the first step in patch management procedures when receiving an emergency security patch, as it helps to ensure that the patch is genuine and not malicious. Validating the authenticity of the patch can be done by verifying the source, signature, checksum, or certificate of the patch, and comparing it with the information provided by the software vendor or manufacturer. Installing an unverified patch may introduce malware, compromise the system, or cause unexpected errors or conflicts.
References = CISM Review Manual 2022, page 3131; CISM Exam Content Outline, Domain 4, Task 4.42; Practical Patch Management and Mitigation1; Vulnerability and patch management in the CISSP exam3