设备评级原则是：一类设备是本单元内存在缺陷，但不影响安全供电，不威胁人身安全。（）
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On the assumption that every OSPF router in a particular area is configured with there is no loopback interface set?（）
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. There will be no router ID until a loopback interface is configured.
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