In physical security what are electronic access control (EAC) tokens used for?

A.
To authenticate subjects

B.
To control the amount of radiation that escapes from control rooms

C.
To lock down a facility or system after an intrusion has been detected

D.
To authenticate objects

Explanation:
Electronic access control (EAC) tokens are used in physical security
to authenticate subjects. They can be proximity readers, programmable locks, or
biometric systems, which identify and authenticate users before allowing them
entrance.