Which of the following methods could be used as a form of eavesdropping using a telephone instrument?

Which of the following methods could be used as a form of eavesdropping using a telephone instrument?
A . Wiring can be altered so the handset or receiver will act as an open microphone.
B . A radio transmitter can be concealed in the mouthpiece.
C . The infinity transmitter can be used.
D . Both band c.
E . All of the above.

Answer: E

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