Computer Networking
HDLC (High-level Data Link Control) is

network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued by ISO.
a method access control technique for multiple-access transmission media
a method of determining which device has access to the transmission medium at any time
None of these

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

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