Which of the following security controls focuses most on prevention of unauthorized access to the power plant?

Which of the following security controls focuses most on prevention of unauthorized access to the power plant?
A . An offboarding procedure is initiated monthly to determine redundant physical access rights.
B . Logs generated by smart locks are automatically scanned to identify anomalies in access patterns.
C . Requests for additional access rights are sent for approval and validation by direct supervisors.
D . Automatic notifications are sent to a central security unit when employees enter the premises during nonwork hours

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Answer: C