The correct answer is deploying a mesh network. A mesh wireless network uses multiple interconnected access points that automatically route traffic through the best available path. This ensures seamless coverage throughout a facility, even when users move between APs. Mesh APs can extend coverage without requiring each AP to be directly wired, making them ideal for large or hard-to-wire environments.

A. Ad hoc access points are peer-to-peer connections and cannot provide enterprise-grade continuous coverage.

B. Ethernet drops provide wired connectivity but do not solve wireless coverage issues.

D. Changing the frequency (from 2.4 GHz to 5 GHz or vice versa) may reduce interference but will not guarantee building-wide seamless connectivity.

Mesh networks are particularly effective in environments with roaming devices (smartphones, tablets, handheld scanners) and ensure that there are no dead spots, thereby delivering continuous wireless access.

References (CompTIA Network+ N10-009):

Domain: Network Infrastructure — Wireless architectures, mesh networking, seamless connectivity.