正解:D
The RIB (Routing Information Base) is essentially the routing table that contains all the routes learned by a router, including directly connected networks, static routes, and routes learned through dynamic routing protocols. The FIB (Forwarding Information Base), also known as the forwarding table, is derived from the RIB and contains only the best routes that are used to forward packets. The FIB is optimized for fast packet forwarding and is what the router's data plane uses to make forwarding decisions.