The difference between a multiplexer and a statistical multiplexer is

1. Multiplexers use TDM (time division multiplexers), while statistical multiplexer users FDM (frequency division multiplexers)
2. Multiplexers often waste the output link capacity while statistical multiplexers optimize it's us
3. Multiplexers use the X 25 protocol, while statistical multiplexers use the ALOHA protocol.
4. Statistical multiplexers need buffers while statistical do not need buffers.

The Right Answer is : Option D

Explanation