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Arndt is on a team that is increasing the security in an office. They want to allow anyone to pass by a door but have

Arndt is on a team that is increasing the security in an office. They want to allow anyone to pass by a door but have an alarm sound whenever someone gets too close to the door. Which sensor would Arndt recommend using?
a. IR sensor
b. microwave sensor
c. ultrasonic sensor
d. pressure sensor

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