Final answer:
The recommended percentage of coverage overlap for adjacent cells in a 2.4-GHz WLAN is 25%.
Step-by-step explanation:
The recommended percentage of coverage overlap for adjacent cells in a 2.4-GHz WLAN is 25% (option b).
When extending the range of a 2.4-GHz WLAN, nonoverlapping channels are used for adjacent coverage cells. However, to prevent a connection from dropping as a user roams from one coverage cell to another, there should be some overlap in coverage between those cells.
This overlap helps to ensure a smooth transition between cells by allowing the user's device to maintain a sufficient signal strength as it moves from one cell to another.