The correct response is D. With default DNS lookup behaviour, Cisco IOS attempts to resolve unrecognized text or hostnames. If a name server is not explicitly configured, the device may try a broadcast-style lookup attempt while translating the entered string. For Cisco CCNA 200-301 v1.1, the important point is the mechanism, not a generic description of the technology. It does not start a ping automatically or ask the user to type an IP address first. 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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