Which IPv6 prefix should you use?

You need to use link-local IPv6 addresses to perform multicasting. Which IPv6 prefix should you use?

A.
FF00::/8

B.
FD00::/8

C.
FE80::/10

D.
FEC0::/10

Explanation:
http://technet.microsoft.com/en-us/library/bb726995.aspx