What are three requirements for a static IPv6-in-IPv4 tunnel? (Choose three.)

What are three requirements for a static IPv6-in-IPv4 tunnel? (Choose three.)
A . A static IPv6 address must be configured.
B . A dynamic IPv6 address must be configured.
C . Cisco Express Forwarding must be enabled.
D . Each tunnel endpoint must support IPv4 and IPv6.
E . A static IPv4 address must be configured.
F . A dynamic IPv4 address must be configured.

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Answer: A,D,E