Computer Networking
The packets switching concept was first proposed

All of these
in the early 1960s for military communication systems, mainly to handle speech
None of these
in the late 1950s for Defense Ministry of US
in the late 1980s for the Defense Ministry of US.

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Computer Networking
Demodulation is a process of

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

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