Discussion
Why statistical multiplexing has higher efficiency ?
Answer: A
Statistical multiplexing is more efficient because it dynamically allocates bandwidth based on demand.
In ordinary (synchronous) time-division multiplexing, every source owns fixed time slots, which go out empty whenever that source has nothing to send. Statistical multiplexing gives link capacity only to the sources that are actually transmitting, slot by slot or packet by packet, so idle users waste nothing and the link can serve more users than its capacity divided by each user's peak rate.
Options B and D describe synchronous TDM, the less efficient scheme statistical multiplexing improves upon. Compression is a separate technique and is not what multiplexing does.
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