Which statement is true concerning 6to4 tunneling?

Which statement is true concerning 6to4 tunneling?

A.
An edge router must use IPv6 address of 2002::/16 in its prefix.

B.
The edge routers can use any locally configured IPv6 address.

C.
Hosts and routers inside a 6to4 site will need a special code.

D.
IPv4 traffic is encapsulated with an IPv6 header.