An engineer is attempting to resolve wireless channel overlap issues in the 2.4 GHz network. Which network change reduces channel overlap?

Shutting down the radios would eliminate the 2.4 GHz network entirely, thus eliminating overlap but also service, which is not a practical solution for reducing overlap while maintaining network functionality.

Enabling 40 MHz channel bonding in the 2.4 GHz band uses two 20 MHz channels, which significantly increases channel overlap and interference given only three non-overlapping channels exist.

Enabling 802.11b data rates (lower data rates) does not directly reduce channel overlap; it can increase range or reliability for individual clients but does not alter the frequency plan.

In the context of resolving 2.4 GHz channel overlap, enabling all 802.11b/g/n channels allows the Dynamic Channel Assignment (DCA) algorithm or Radio Resource Management (RRM) to utilize the full set of non-overlapping channels (1, 6, and 11) for optimal placement. This ensures that APs can be assigned channels that minimize co-channel interference and actual overlap, especially if the system was previously restricted to a suboptimal channel subset.