When the sender and the receiver of an email are on different systems, we need only ______ .
A. One MTA
B. Two UAs
C. Two UAs and one pair of MTAs
D. Two UAs and two pairs of MTAs
Answer:A
When the sender and the receiver of an email are on different systems, we need only ______ .
A. One MTA B. Two UAs C. Two UAs and one pair of MTAs D. Two UAs and two pairs of MTAs
Explanation: None.