The correct response is D. To send CDP information only toward Router C, CDP must remain enabled on the interface facing C and be disabled on the other relevant interfaces. CDP is a Cisco Layer 2 neighbor discovery protocol, so interface-level control determines which neighbors receive advertisements. For Cisco CCNA 200-301 v1.1, the important point is the mechanism, not a generic description of the technology. A global shutdown would stop CDP everywhere, and clearing the table would not change future advertisements. When this appears in a network, the symptom normally confirms the answer: the route installed, the state selected, the packet forwarded, the wireless client behaviour, or the management workflow will follow this rule. That is why this answer is the best fit for the scenario and not just a plausible networking term.
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