The correct response is C. The data plane handles packet switching and forwarding through a router. It moves transit traffic from ingress to egress based on forwarding information produced by the control plane. For Cisco CCNA 200-301 v1.1, the important point is the mechanism, not a generic description of the technology. The control plane builds routes, management handles administration, and application is not the router forwarding plane. 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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