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 req uire 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.