The most commonly used external intruder detection sensors include all of the following except:
A) electromagnetic cable
B) drop-arm barrier
C) fluid pressure
D) fiber optic cable
E) active infrared system

Question

Quizplus · Accepted Answer

Drop-arm barriers are not typically used as intrusion detection sensors. The other options listed are commonly used for this purpose, with active infrared systems being one of the most popular choices.

The Most Commonly Used External Intruder Detection Sensors Include All