Computer Networking
A WATS arrangement

None of these
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
is never less expensive than flat-rate service

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Computer Networking
Demodulation is a process of

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

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