Passive Infrared Sensors (PIR) used in a non-climate controlled environment should

Passive Infrared Sensors (PIR) used in a non-climate controlled environment should
A . reduce the detected object temperature in relation to the background temperature.
B . increase the detected object temperature in relation to the background temperature.
C . automatically compensate for variance in background temperature.
D . detect objects of a specific temperature independent of the background temperature.

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Answer: C