When both sender and receiver are connected to a mail server via a LAN

1.	When both sender and receiver are connected to a mail server via a LAN or a WAN, we need ___________________.
A.	two UAs, two pairs of MTAs, and a pair of MAAs
B.	two UAs, and two pairs of MTAs
C.	two UAs, two pairs of MTAs, and two pairs of MAAs
D.	none of the above
Answer» B. two UAs, and two pairs of MTAs

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When both sender and receiver are connected to a mail server via a LAN or a WAN, we need ___________________.

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