What is a mantrap?

A.
An trusted security domain

B.
A logical access control mechanism

C.
A double-door facility used for physical access control

D.
A fire suppression device

Explanation:
A mantrap is a two-doored area used for physical access into a
facility or area. The first door is unlocked and a person enters the room. The
second door stays locked until the person has been properly identified,
authenticated, and authorized access. The identification and authorization entity
can be a swipe card reader, a biometric system, a smart card reader, or a security
guard. Some mantraps that use biometric systems can weigh the person before allowing
him access to ensure that only one person is attempting entry. This is to fight
tailgating attempts.