Which of the following is not a physical access control?

Which of the following is not a physical access control?

A.
Turnstiles

B.
Fencing

C.
Host-based IDS

D.
Exterior lighting

Explanation:
Host-based intrusion detection systems (IDS) are considered technical or logical controls because they exist within computer systems and monitor activities. The other controls all exist to provide some type of physical protection.