Your Company Wants to Secure the New Data Center Physically

Multiple Choice

Your company wants to secure the new data center physically. The company has hired a security guard but wants to find a way so that only one person at a time can enter in the data center. As people enter, they will have to show the security guard identification that authorizes them to enter the data center.  
What is your company's new security called?

A) Theft prevention
B) Mantrap
C) Entry control roster
D) Security outpost