If all OSPF routers in a single area are configured with the same priority value,what value dose a router use for the ODPF router ID in the absence of a loopback interface?（）
- A the IP address of the first Fast Ethernet interface
- B the IP address of the console management interface
- C the highest IP address among its active interfaces
- D the lowest IP address among its active interfaces
- E the priority value until a loopback interface is configured