Which statement is true concerning 6to4 tunneling?()
A、A. The edge routers can use any locally configured IPv6 address.
B、B. Hosts and routers inside a 6to4 site will need a special code.
C、C. An edge router must use IPv6 address of 2002::/16 in its prefix.
D、D. IPv4 traffic is encapsulated with an IPv6 header.