Computer Networking
The packets switching concept was first proposed

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

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Computer Networking
A WATS arrangement

None of these
is less expensive than flat-rate service only when the number of calls is large and the duration of each is short
is never less expensive than flat-rate service
is always less expensive than flat-rate service
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long

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