Computer Networking
A remote batch-processing operation in which data is solely input to a central computer would require a:

telegraph line
mixedband channel
simplex lines
All listed here
None of these

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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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