Correct Answer. B. The new access points have overlapping channels with existing ones Overlapping channels can cause interference and connectivity issues in environments with multiple access points.
Option A is incorrect. A lack of IP addresses would prevent connections but would not typically cause intermittent connectivity.
Option C is incorrect. While important, firmware updates are less likely to cause intermittent issues specifically related to new expansion areas.
Option D is incorrect. Cable quality affects wired connections, not the wireless signal quality or connectivity.