Which of the following BEST characterizes a mantrap or deadman door, which is used as a deterrent control for the vulnerability of piggybacking?
A . A monitored double-doorway entry system
B . A monitored turnstile entry system
C . A monitored doorway entry system
D . A one-way door that does not allow exit after entry
Answer: A
Explanation:
A monitored double-doorway entry system, also referred to as a mantrap or deadman door, is used a deterrent control for the vulnerability of piggybacking.