Which of the following can you do to express an IPv6 address as efficiently as possible?
(Select 2 choices.)

A.
Replace every four-character group of zeros with double colons.

B.
Remove leading and trailing zeros from each four-character group.

C.
Remove only leading zeros from each four-character group.

D.
Remove only trailing zeros from each four-character group.

E.
Replace only one four-character group of zeros with a double colon.

F.
Replace one or more contiguous four-character groups of zeros with a double colon.