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Answer is C.

The start and stop bits are used to synchronize the serial receivers.

Reference: http://esd.cs.ucr.edu/labs/serial/serial.html

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Start and stop bits are used for Synchronisation in serial data communication

 

To establish a serial communication link between the PC and the 8051.

Serial communication is often used either to control or to receive data from an embedded microprocessor. Serial communication is a form of I/O in which the bits of a byte begin transferred appear one after the other in a timed sequence on a single wire. Serial communication has become the standard for intercomputer communication. In this lab, we'll try to build a serial link between 8051 and PC using RS232.
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