A small office is running WiFi 4 APs, and neighboring offices do not want to increase the throughput to associated devices. Which of the following is the MOST cost-efficient way for the office to incr

Adding another AP increases costs for hardware and management and may cause co-channel interference in a small office environment, making it less cost-efficient than a standards upgrade.

Disabling 2.4GHz radios would reduce coverage and eliminate backward compatibility with older 2.4GHz-only client devices, potentially degrading rather than improving overall network performance.

Enabling channel bonding on WiFi 4 in the 2.4GHz band would consume more of the limited spectrum, causing interference with neighboring offices-which the question states the neighbors do not want.

Upgrading to WiFi 5 (802.11ac) provides significantly higher throughput, operates on the 5GHz band with more available channels, and supports features like MU-MIMO and wider channel widths. This is the most cost-efficient upgrade path because it directly replaces aging WiFi 4 (802.11n) infrastructure with modern standards that deliver better performance without requiring multiple additional APs or causing interference to neighbors.