Computer Networking
The difference between a multiplexer and a statistical multiplexer is

Multiplexers use Time Division Multiplexing (TDM) while statistical multiplexers use Frequency Division Multiplexing (FDM)
None of these
Statistical multiplexers need buffers while multiplexers do not need buffers
Multiplexers often waste the output link capacity while statistical multiplexers optimize its use
Multiplexer use X.25 protocol, while statistical multiplexers use the Aloha protocol

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Computer Networking
Baseband is

None of these
transmission of signals without modulation
All of these
a signal all of whose energy is contained within a finite frequency range
the simultaneous transmission of data to a number of stations

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