Computer Networking
Carrier is

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
the condition when two or more sections attempt to use the same channel at the same time
None of these
a continuous frequency capable of being modulated or impressed with a second signal

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Computer Networking
Demodulation is the process of

dividing the high-speed signals into frequency bands
converting digital signals to analog signals
converting analog signals to digital signals
combining many low speed channels into one high speed channel
None of these

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