When the sender and the receiver of an email are on different systems, we need only _________

A. Submits the message to a message transfer agent (mta). then the mta sends the message to another mta i.e. a mail relay. then the receiver receives the message from the mail relay whenever it is available.
B. Two uas
C. Two uas and one mta

D. Two uas and two mtas

Explanation: The sender’s User Agent (UA) submits the message to a Message Transfer Agent (MTA). Then the MTA sends the message to another MTA i.e. a mail relay. Then the receiver receives the message from the mail relay whenever it is available.

Occurrence: 0, System Administrator 2026