B. CCTV is good for deterring unauthorized physical access but cannot prevent it. It can be used to detect tailgating by monitoring live footage but cannot prevent the attack by itself.
C. proximity card readers are used to authenticate physical access to specific locations by scanning a smart key. If the attacker is close to the victim, he/she can gain access to the secured area. For instance, the attacker can hold the door open after the card is scanned.
D. Faraday cage is irrelevant to the scope of the question
In my opinion the answer is A:
Tailgating is the practice of one person following closely
behind another without showing credentials. Access control
vestibules (sometimes called mantraps) help prevent
tailgating
An access control vestibule is a physical security measure that consists of a small enclosed area with two sets of doors. It ensures that only one person is allowed to enter at a time, preventing unauthorized individuals from following closely behind an authorized person. The first set of doors must close and secure before the second set of doors can be opened, creating a controlled entry point.
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