IMAP4 requires port ____ to be open.

A.
80

B.
3869

C.
22

D.
21

E.
23

F.
25

G.
110

H.
143

I.
443

Explanation:
The current version of IMAP (IMAP4) uses port 143 and TCP for connection.
Reference: Security + (SYBEX) page 130