Answer : 4. "In the routing table and the topology table"
Explanation :

Answer: D) In the routing table and the topology table Explanation: Successor routes are going to be in the routing table since they are the best path to a remote network. However, the topology table has a link to each and every network, so the best answer is topology table and routing table. Any secondary route to a remote network is considered a feasible successor, and those routes are found only in the topology table and used as backup routes in case of primary route failure.