Computer Networking
Bus is

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

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Computer Networking
Modulation is the process of

Multiplexing various signals into high speed line signals
converting digital signals to analog signals
performing data encryption.
converting analog signals to digital signals

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