Refer to the exhibit. Which interoperability technique implemented on the dual - stack routers would allow connectivity between IPv6 sites across automatic created tunnels using the 2002::/16 prefix? （） 
- A、Dual Stack
- B、NAT - PT
- C、6to4 tunnel
- D、GRE tunnel
- E、ISATAP tunnel
正确答案:C
答案解析:有
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