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.