The intrusion detection system in which a pattern of radio waves is transmitted and partially reflected back to the antenna is known as a(n):

The intrusion detection system in which a pattern of radio waves is transmitted and partially reflected back to the antenna is known as a(n):
A . Capacitance detection system
B . Ultrasonic detection system
C . Vibration detection system
D . Electromechanical detection system
E . Microwave detection system

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Answer: E