OSPF is enabled on router

A.
You execute the following command on router A and receive the accompanying output:
RouterA#ping 224.0.0.5 repeat 1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.0.0.5, timeout is 2 seconds:
Reply to request 0 from 10.100.100.1, 4 ms
10.100.100.1 is the IP address of a loopback interface on router A.
What can you conclude about router A?
Select the best response.
Only the router A loopback interface is participating in the OSPF routing process.

A.
You execute the following command on router A and receive the accompanying output:
RouterA#ping 224.0.0.5 repeat 1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.0.0.5, timeout is 2 seconds:
Reply to request 0 from 10.100.100.1, 4 ms
10.100.100.1 is the IP address of a loopback interface on router A.
What can you conclude about router A?
Select the best response.
Only the router A loopback interface is participating 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.