Which name describes an IPV6 host-enable tunneling technique that uses IPV4 UDP, does not require dedicated gateway tunnels, and can pass through existing IPV4 NAT gateways?

Which name describes an IPV6 host-enable tunneling technique that uses IPV4 UDP, does not require dedicated gateway tunnels, and can pass through existing IPV4 NAT gateways?
A. dual stack
B. dynamic
C. Teredo
D. Manual 6to4

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