Which of the following is an example of a physical barrier used to restrict entry?

• A. Video surveillance.
• B. Physical barriers (doors, gates).
• C. Credentialed access (badges, cards).
• D. Procedural controls (visitor check-in, sign-in).

Answer: (B)

A physical barrier is a tangible structure that blocks entry, creating a real, physical boundary that must be passed through or around to gain access. Doors, gates, and other barriers directly prevent unauthorized entry by occupying space and requiring action (like opening the door or passing through a gate) to proceed. This is why the option describing doors and gates fits best as a physical barrier.

Video surveillance, while valuable for detection and deterrence, does not itself block entry. Credentialed access controls manage who is allowed in by authenticating identity, but the barrier to entry is still the physical structure and its locks, not the credential itself. Procedural controls govern behavior and processes (such as sign-in routines) rather than providing a physical obstacle.