To configure 6to4 on a dual-stack edge router. Which three of the following are valid in 6to4
Tunneling configuration? (Choose three)

A.
IPv4 Tunnel IP address

B.
Tunnel mode (6to4)

C.
Tunnel Keepalives

D.
IPv4 Tunnel Destination

E.
IPv4 Tunnel Source.

F.
6to4 IPv6 address (within 2002 /16)

Explanation:
http://packetlife.net/blog/2010/mar/15/6to4-ipv6-tunneling/ (see 6to4 configuration, all
three bullets)