XON/ XOFF - Representation of handshaking variant

Q.  Which among the below stated lines represent the handshaking variant usually and only controlled by the software in the handshaking process?
- Published on 09 Nov 15

a. XON/ XOFF
b. DCD & GND
c. TxD & RxD
d. All of the above

ANSWER: XON/ XOFF

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