Computer Networking
A WATS arrangement

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

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Computer Networking
Bulletin board system

None of these
converts digital signals to analog signals
converts analog signals to digital signals
is a modem capable of accepting commands
is a public access message system

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