OSPF is enabled on router A. You execute the following command on router A and receive theaccompanying output:RouterA#ping 224.0.0.5 repeat1Type escape sequence to abort.Sending 1, 1 00 - byte ICMP Echos to 224.0.0.5, timeout is 2 seconds:Reply to request 0 from 10.100.100.1, 4 ms10.100.100.1 is the IP address of a loopback interface on router A. What can you conclude about router A?（）

• A、Only the router A loopback interface is parti cipating in the OSPF routing process
• B、None of the router A interfaces are participating in the OSPF routing process
• C、Router A is using the loopback interface IP address as its OSPF router ID
• D、Router A does not have any reachable OSPF neighbors