What are two differences between IPv6 ISATAP tunneling and IPv6 6to4 tunneling? (Choose two)

What are two differences between IPv6 ISATAP tunneling and IPv6 6to4 tunneling? (Choose two)
A . Only ISATAP tunneling can transfer IPv6 multicast packets
B . Only 6to4 tunneling transfers unicast IPv6 packets within a site
C . Only ISATAP tunneling transfers unicast IPv6 packets between sites
D . Only ISATAP tunneling transfers unicast IPv6 packets within a site
E . Only 6to4 tunneling requires 2002::/16 addresses

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Answer: D, E