Computer Networking
Demodulation is a process of

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

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Computer Networking
A front-end processor is

a minicomputer that relieves main-frame computers at a computer centre of communications control functions
None of these
preliminary processor of batch jobs.
a user computer system
a processor in a large-scale computer that executes operating system instructions

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