The correct answer is D. "If you do not configure the IPv4 router-id in the IPv6 OSPF or BGP routing instance, then the IPv6 protocols will use invalid IPv4 address 0.0.0.0 and the adjacencies and connections will fail."
You must configure a router-id in order for BGP and OSPF to function in a routing instance. Use the show route instance detail command to display the router-id value for a routing instance. If the router-id is 0.0.0.0, then the routing instance has no router-id.
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