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A communications device that combines transmissions from several I/O devices into one line is a 

  • A.concentrator
  • B.modifier
  • C.multiplexer
  • D.full-duplex line

Answer: C

Correct answer: multiplexer

A multiplexer combines several input streams onto one line and separates them again at the far end. A concentrator also shares a line but buffers and forwards rather than dividing it into fixed channels.

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