The intrusion detection system that is used on safes, walls, and openings in an effort to establish an electrostatic field around an object to be protected is known as a(n):

The intrusion detection system that is used on safes, walls, and openings in an effort to establish an electrostatic field around an object to be protected is known as a(n):
A . Capacitance detection system
B . Ultrasonic detection system
C . Contact microphone detection system
D . Microwave detection system
E . Radio frequency detection system

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Answer: A