Computer Networking
After coding a document into a digital signal, it can be sent by telephone, telex or satellite to the receiver where the signal is decoded and an exact copy of the original document is made. What is it called?

Facsimile
Electronic mail
Telex
None of these
Word processor

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Computer Networking
Modulation is the process of

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

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