Which of the following statements regarding EIGRP successor routes is valid?（）

• A、A successor route is used by EIGRP to forward traffic to destination.
• B、Successor routes are saved in the topology table to be used if the primary route fails.
• C、Successor routes are flagged as "active" in the routing table.
• D、A successor route may be backed up by a feasible successor route.
• E、Successor routes are stored in the neighbor table following the discovery process.