Computer Networking
A characteristic of a multiprogramming system is:

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

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Computer Networking
The network layer, in reference to the OSI model, provide

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

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