What is recommended for the wireless infrastructure design of an organization?

The correct response is B. For 2.4-GHz Wi-Fi, the standard nonoverlapping channel plan uses channels 1, 6, and 11. Adjacent APs should be placed on nonoverlapping channels to reduce co-channel and adjacent-channel interference. For Cisco CCNA 200-301 v1.1, the important point is the mechanism, not a generic description of the technology. Grouping nearby APs on the same channel or physically adjacent overlapping channels increases contention and lowers performance. 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.