Computer Networking
A WATS arrangement

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
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

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Computer Networking
Contention is

the condition when two or more stations attempt to use the same channel at the same time
a continuous frequency capable of being modulated or impressed with a second signal
a collection of interconnected functional units that provides a data communications service among stations attached to the network
One or more conductors that serve as a common connection for a related group of devices
None of these

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