Which statement describes the difference between a manually configured IPv6 in IPv4
tunnel versus an automatic 6to4 tunnel?

A.
An automatic 6to4 tunnel does not require dual-stack (IPv4 and IPv6) routers at the tunnel
endpoints.

B.
An automatic 6to4 tunnel allows multiple IPv4 destinations.

C.
A manually configured IPv6 in IPv4 tunnel allows multiple IPv4 destinations.

D.
A manually configured IPv6 in IPv4 tunnel does not require dual-stack (IPv4 and IPv6)
routers at the tunnel endpoints.