A company wants to prevent non-authorized users from entering into a secure building.
Which of the following will BEST mitigate this activity?

A.
Train users on tailgating

B.
Implement an escort policy

C.
Install mantraps

D.
Require all users to have badges

Explanation:

Reference:
http://whatis.techtarget.com/definition/mantrap-interlocking-door-controller