Q:

The physical layer, in reference to the OSI model, defines

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The physical layer, in reference to the OSI model, defines


  1. the virtual circuit interface to packet-switched service
  2. the interface between the X.25 network and packet mode device
  3. data link procedures that provide for the exchange of data via frames that can be sent and received
  4. All of the above

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 (b).the interface between the X.25 network and packet mode device

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