The type of sensor that is not influenced by exterior noise, reacts only to movement within a protected area, and can also be adjusted to the movement of air caused by a fire to activate the alarm is known as a(n):

The type of sensor that is not influenced by exterior noise, reacts only to movement within a protected area, and can also be adjusted to the movement of air caused by a fire to activate the alarm is known as a(n):
A . Proximity sensor
B . Radar sensor
C . Vibration sensor
D . Ultrasonic sensor
E . Microwave sensor

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Answer: D