________ provides service to the user to make the process of sending and receiving a message easier.

________ provides service to the user to make the process of sending a

1.	________ provides service to the user to make the process of sending and receiving a message easier.
A.	An MTA
B.	An MAA
C.	A UA
D.	none of the above
Answer» D. none of the above

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________ provides service to the user to make the process of sending and receiving a message easier.

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