Your MPLS implementation is currently using internal backdoor links. What can you do to minimize the impact of having these links?（）

• A、use BGP as the CE-PE routing protocol
• B、use OSPF as the CE-PE routing protocol
• C、use EIGRP as the CE-PE routing protocol
• D、use the SP to redistribute routes as external routes for OSPF and EIGRP
• E、use route redistribution at each location to ensure external routes are imported into the IGP