Computer Networking
A WATS arrangement

None of these
is never less expensive than flat-rate service
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long
is always less expensive than flat-rate service
is less expensive than flat-rate service only when the number of calls is large and the duration of each is short

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Computer Networking
An encyclopedic database

None of these
is an information utility that specializes in storing and searching information
is easy for beginners to use
All of these
is generally free

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Computer Networking
Demodulation is a process of

multiplexing various signals into one high speed line signals
performing data description.
converting analog to digital signals
converting digital to analog signals

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