The beginning and the end of each transfer during asynchronous communication data transfer are
marked by?

A.
Start and Stop bits.

B.
Start and End bits.

C.
Begin and Stop bits.

D.
Start and Finish bits.

Explanation:
The ASYNCHRONOUS (ASYNC) format for data transmission is a procedure or protocol in which each
information CHARACTER or BYTE is individually synchronized or FRAMED by the use of Start and Stop
Elements, also referred to as START BITS and STOP BITS. The Asynchronous Transmission Format is
also known as START-STOP mode or CHARACTER mode. Each character or byte is framed as a
separate and independent unit of DATA that may be transmitted and received at irregular and
independent time intervals. The characters or bytes may also be transmitted as a contiguous stream
or series of characters.