Which of the following statements is incorrect?

A. Multiplexers are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line.

B. HDLC is a standard synchronous communication protocol.

C. RTS/CTS is the way the DTE indicates that it is ready to transmit data and the way the DCE indicates that it is ready to accept data.

D. RTS/CTS is the way the terminal indicates ringing

E. None of the above

Answer: Option D

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