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Cisco Certified Network Associate (CCNA) · Cisco
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B is correct
Discontinuous is just an overly flowery way of saying non-overlapping. So B.
B. Discontinuous frequency ranges In the context of Wi-Fi, channels are specific frequency ranges within the radio spectrum that wireless networks use for communication. Nonoverlapping channels are those that do not interfere with each other. To achieve this, they must have discontinuous frequency ranges to avoid overlapping and causing interference. For example, in the 2.4 GHz band commonly used by Wi-Fi networks, the nonoverlapping channels are typically 1, 6, and 11. Using these channels helps reduce interference between adjacent access points and improves overall network performance.