The OSPF External LSA for prefix x.x.x.x exists in the OSPF database， but the prefix is not installed in therouting table. Which are possible explanations？（）

A. Inbound distribute-list is configured under the ospf process and it is denying x.x.x.x
B. ASBR origination the LSA is not reachable
C. Route to the Forwarding Address in not an internal OSPF route
D. Route to the Forwarding Address is an internal OSPF route
E. Route to the ASBR does not follow the same path as the one to the Forwarding Addre