Which two steps must you perform on each device that is configured for IPv4 routing before you implement OSPFv3? (Choose two)

Which two steps must you perform on each device that is configured for IPv4 routing before you implement OSPFv3? (Choose two)
A . configure an autonomous system number
B . configure a loopback interface
C . configure a router ID
D . Enable IPv6 on an interface
E . Enable IPv6 unicast routing

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Answer: DE