A network engineer notices inconsistent Cisco Discovery Protocol neighbors according to the diagram that is provided.The engineer notices only a single neighbor that uses Cisco Discovery Protocol,but it has several routing neighbor relationships.What would cause the output to show only the single neighbor?

A. The routers are connected via a Layer 2 switch.
B. IP routing is disabled on neighboring devices.
C. Cisco Express Forwarding is enabled locally.
D. Cisco Discovery Protocol advertisements are inconsistent between the local and remote devices.


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