Visitors entering a building are required to close the back door before the front door of the same
entry room is open. Which of the following is being described?

A.
Tailgating

B.
Fencing

C.
Screening

D.
Mantrap

Explanation:

Mantraps are designed to contain an unauthorized, potentially hostile person/individual physically
until authorities arrive. Mantraps are typically manufactured with bulletproof glass, high-strength
doors, and locks and to allow the minimal amount of individuals depending on its size. Some
mantraps even include scales that will weigh the person. The doors are designed in such a way as
to open only when the mantrap is occupied or empty and not in-between. This means that the
backdoor must first close before the front door will open; exactly what is required in this scenario.