Which of the following is the shortest valid abbreviation for
FE80:0000:0000:0000:0010:0000:0000:0123?

A.
FE80::10::123

B.
FE8::1::123

C.
FE80:0:0:0:10::123

D.
FE80::10:0:0:123

Explanation:

Inside a quartet, any leading 0s can be omitted, and one sequence of one or more
quartets of all 0s can be replaced with “::”. The correct answer replaces the longer
three-quartet sequence of 0s with ::.