Computer Networking
The data communication support should include, but is not restricted to

file transfer and transaction processing
terminal support, electronic mail and voice grams.
All of these
file and database access

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Computer Networking
Carrier is

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
None of these
a collection of interconnected functional units that provides a data communications service among stations attached to the network
the condition when two or more sections attempt to use the same channel at the same time

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