B is the way to go. The management plane DCN needs to communicate with each NE, and the OSS/OBS interface is the designed way to do that. Simple as that.
Haha, why do they always make these questions so convoluted? I'll go with C. The management plane DCN can be connected to each NEs directly. Seems the most straightforward option.
D seems like the right choice to me. The management plane DCN enables direct communication between the NEs, which is crucial for effective network management.
I think the correct answer is B. The management plane DCN can be connected to each NEs via OSS/OBS interface. This makes sense as the OSS/OBS interface is used for management communication.
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