The following description of the NG WDM equipment connected to the network management computer, which is wrong?

The following description of the NG WDM equipment connected to the network management computer, which is wrong?
A . Connect to the network management computer can be connected directly or through a local area network, depending on the situation
B . If the subrack connection mode is master-slave mode, the network management computer must be connected to the main subrack.
C . The IP addresses of all network elements must be in the same address range as the IP address of the network management computer.
D . Only the gateway network element needs to be connected to the network management computer.

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Answer: C