Computer Networking
In geosynchronous orbit, satellite

None of these
moves faster than the earth's rotation so that it can cover larger portion of earth.
moves simultaneously
remains in a fixed position related to points on earth
remains in a fixed position so that as earth rotates, it can fully cover the earth

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Computer Networking
The packets switching concept was first proposed

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

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