正解:C
A post-incident review is a process of analyzing an incident and its impact, identifying the root causes, and recommending corrective actions to prevent recurrence. The first step of a post-incident review is to perform root cause analysis, which is the process of identifying the underlying factors that contributed to the occurrence and severity of the incident. Root cause analysis helps to determine the most effective and efficient solutions to address the problem and avoid future incidents. References = CISM Review Manual,
16th Edition, Chapter 5, Section 5.5.2.11