If all OSPF routers in a single area are configured with the same priority value, what value does a router use for the OSPF router ID in the absence of a loopback interface?

If all OSPF routers in a single area are configured with the same priority value, what value does a router use for the OSPF 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

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Answer: C