The correct response is D. The listed choice that matches FHRP operation is the exchange of multicast hello messages between routers. Those hello messages let routers negotiate active, standby, master, or backup roles for a shared default-gateway function. For Cisco CCNA 200-301 v1.1, the important point is the mechanism, not a generic description of the technology. The better conceptual purpose is gateway redundancy, but among these options the multicast hello behaviour is the FHRP-specific answer. 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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