[Solved] RS-232, RS-449, RS-530, V-24, and X-21 are examples of?

Q.	RS-232, RS-449, RS-530, V-24, and X-21 are examples of?
A.	standards for various types of transmission channels.
B.	standards for interfaces between terminals and modems.
C.	two methods of error detection and correction
D.	standards for end-to-end performance of data communication systems.
Answer» B. standards for interfaces between terminals and modems.

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