A system using inaudible sound waves to detect the presence of an intruder or other disturbance is known as a(n):

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A system using inaudible sound waves to detect the presence of an intruder or other disturbance is known as a(n):
A . Motion detection system
B . Ultrasonic motion detection system
C . Sonic motion detection system
D . Vibration detection system
E . None of the above

Answer: B