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Which among the following does not allow multiple uses or devices to share one communication line?

  • A.doubleplexer
  • B.multiplexer
  • C.concentrator
  • D.controller

Answer: A

Correct answer: doubleplexer

Multiplexers, concentrators and controllers all let several devices share one line. Doubleplexer is not a device at all, which is what makes it the answer.

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