问题：

[多选] 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