Which design consideration must be made when using IPv6 overlay tunnels?

Which design consideration must be made when using IPv6 overlay tunnels?
A . Overlay tunnels that connect isolated IPv6 networks can be considered a final IPv6 network architecture.
B . Overlay tunnels should only be considered as a transition technique toward a permanent solution.
C . Overlay tunnels can be configured only between border devices and require only the IPv6 protocol stack.
D . Overlay tunneling encapsulates IPv4 packets in IPv6 packets for delivery across an IPv6 infrastructure.

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Answer: C