Which IPv6 tunneling mechanism requires a service provider to use one of its own native IPv6 blocks to guarantee that its IPv6 hosts will be reachable?

Which IPv6 tunneling mechanism requires a service provider to use one of its own native IPv6 blocks to guarantee that its IPv6 hosts will be reachable?
A . automatic 4to6 tunneling
B . NAT-PT tunneling
C . ISATAP tunneling
D . 6rd tunneling
E . automatic 6to4 tunneling
F . manual ipv6ip tunneling

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Answer: D