What are two benefits of using 6to4 as an IPv6 transition method? (Choose two.)

What are two benefits of using 6to4 as an IPv6 transition method? (Choose two.)
A . 6to4 tunnels allow isolated IPv6 domains to be remotely connected over IPv4 networks.
B . Manual configuration (scalability) is easier.
C . Point-to-multipoint automatic tunneling (automatic 6to4) is available.
D . An infinite number of address spaces are allocated to an IPv6 subnet.
E . Globally unique IPv4 addresses are not required.

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Answer: A, C