What does a unicast prefix-based IPv6 multicast address start with?

A.
FF80

B.
FF3

C.
FF

D.
FF7

Explanation:
From RFC 3306, the following are a few examples of the structure of unicast prefix-based
multicast addresses.
– Global prefixes – A network with a unicast prefix of
3FFE:FFFF:1::/48 would also have a unicast prefix-based
multicast prefix of FF3x:0030:3FFE:FFFF:0001::/96 (where ‘x’
is any valid scope).
– SSM – All IPv6 SSM multicast addresses will have the format
FF3x::/96.