Which is not a preventive physical security control?

A.
Fences

B.
Locks

C.
Security guard

D.
Access and audit log

Explanation:
Any type of logging or auditing is considered a detective control,
because these items are mainly reviewed after something took place. The other
answers contain items that are put into place to prevent some type of security
compromise. Logs and audits are not considered components that can be used to
prevent a compromise from taking place.