Question: Which transmission medium uses a technique called wavelength division multiplexing ( WDM ) for bidirectional and full - duplex communications? Optical fiber Unshielded twisted -

Which transmission medium uses a technique called wavelength division multiplexing (WDM) for bidirectional and full-duplex communications?
Optical fiber
Unshielded twisted-pair
Shielded twisted-pair
Coaxial cable

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