A、The IP address of the backup designated router （BDR） is FE80：：205：5FFF：FED3：5808
B、This is the designated router （DR） on the FastEthernet 0/0 link
C、Interface FastEthernet 0/0 was configured with the ipv6 ospf 1 area 1 command
D、OSPF version 2 has been enabled to support IPv6
E、The output was generated by the show ip interface command