A microphone that is installed on a common wall adjacent to the target area when it is impractical or impossible to enter the target area is known as a:

A microphone that is installed on a common wall adjacent to the target area when it is impractical or impossible to enter the target area is known as a:
A . Carbon microphone
B . Parabolic microphone
C . Contact microphone
D . Dynamic microphone
E . None of the above

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Answer: C