Which two statements about IPv6 6to4 tunnels are true? (Choose two)

Which two statements about IPv6 6to4 tunnels are true? (Choose two)
A . Sites use addresses from the 2002::/16 prefix
B . Sites use addresses from link-local scope
C . They are point-to-multipoint tunnels
D . They are point-to-point tunnels
E . They rely on GRE encapsulation

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Answer: AC