Discussion
The start and stop bits are used in serial communication for
Answer: C
Start and stop bits are used in serial (asynchronous) communication for synchronization. The start bit tells the receiver that a character is beginning, so it can start sampling at the right moment, and the stop bit marks the end of the character and returns the line to idle.
They are not used for error detection or correction (parity bits do detection), and they do not slow the communication down; in fact they add a little overhead.
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