They’re all valid in their own special way

Which of these is a valid IPv6 address?

A) 2001:::5a88:20a:aff

B) fe80::6ah8:30ab:30

C) fe80:1000:3a88:3011:74dc:3a90:2a77

D) 2601::5502:d101::7908

E) 2601:5:d101:700:12dd:b1ff:fe9a:1edf

F) I don’t think we need to pick favorites