I believe the answer here is D.
You need to enable inet6 to be able to do OSPFv3. As OSPFv3 uses the link-local address which wont be there if you don't have inet6 defined.
if you want to use OSPFv3 for IPv4 routing, you would typically configure the family inet6 option along with the family inet option to enable OSPFv3 to handle both IPv6 and IPv4 routing.
B
https://community.cisco.com/t5/ipv6/ospfv3-basic-question/td-p/2372187
or
https://www.ciscopress.com/articles/article.asp?p=3188198#:~:text=OSPF%20Version%203%20(OSPFv3)%2C,essentially%20the%20same%20for%20OSPFv3.
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