Which of the following does not pertain to the foil-type sensor?

Which of the following does not pertain to the foil-type sensor?
A . The cost of installation is cheap.
B . The cost of the sensor is cheap.
C . It acts as a psychological deterrent.
D . It is subjected to false alarms because of breaks.
E . Small cracks in the tape, or foil, will disable it.
F . All of the above.

Answer: A

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