Computer Networking
Carrier is

One or more conductors that serve as a common connection for a related group of devices
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
a continuous frequency capable of being modulated or impressed with a second signal
None of these

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Computer Networking
Demodulation is a process of

multiplexing various signals into one high speed line signals
converting digital to analog signals
performing data description.
converting analog to digital signals

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