It is after curfew (approximately 0100 hours) at a women’s multi-level security institution. A medium security classified offender exits the side door of her housing unit. She runs towards the nearest part of the perimeter fence. She jumps onto the wire fence. She begins to climb towards the top of the fence.

Assuming that all of the following perimeter security systems are functioning properly, which one would FIRST trigger an alarm in the Main Communication Control Post (MCCP)?

a. The fence disturbance system.

b. The roof-top motion detection system.

c. The door alarm.

d. The elevated “eye-in-the-sky” closed circuit TV camera.