A duplexer is used to

A duplexer is used to 

(A) Couple two antennas to a transmitter without interference (B) isolate the antenna from the local oscillator (C) prevent interference between two antennas connected to a receiver (D) use an antenna for reception or transmission without interference.
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Answer :

A duplexer is used to prevent interference between two antennas connected to a receiver

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