Computer Networking
A WATS arrangement

is always 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
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 large and the duration of each is short

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Computer Networking
An encyclopedic database

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

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Computer Networking
The main difference between synchronous and asynchronous transmission is

the pulse height is different.
the clocking is mixed with the data in asynchronous transmission
None of these
the bandwidth required is different
the clocking is derived from the data in synchronous transmission

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