Computer Networking
Contention is

a collection of interconnected functional units that provides a data communications service among stations attached to the network
None of these
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
One or more conductors that serve as a common connection for a related group of devices

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Computer Networking
Bulletin board system

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

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