Computer Networking
A characteristic of a multiprogramming system is:

None of these
All listed here
simultaneous execution of program instructions from two applications
multiple CPUs
concurrent processing of two or more programs

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

the interface between the X.25 network and packet mode device
the virtual circuit interface to packet-switched service
All of these
data link procedures that provide for the exchange of data via frames that can be sent and received
None of these

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