Computer Networking
The synchronous modems are more costly than the asynchronous modems because

None of these
they operate with a larger bandwidth
they produce large volume of data
they transmit the data with stop and start bits.
they contain clock recovery circuits

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

None of these
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
a very common bit-oriented data link protocol issued by ISO.
network access standard for connecting stations to a circuit-switched network

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