Which of the following is a design best practice for AP placement in a high-density environment like a lecture hall?

Increasing transmit power enlarges cells and extends co-channel interference between APs on the same channel, degrading overall performance in high-density deployments.

Omni-directional antennas broadcast in all directions and are difficult to control in dense environments; directional or downtilt antennas are often preferred to shape and limit cell coverage precisely.

Lowering AP transmit power in high-density venues creates smaller, more controlled RF cells that allow the same channels to be reused more aggressively across the space, boosting aggregate capacity while minimizing co-channel interference - this is the foundational cell-splitting technique for high-density WLAN design.

Placing APs directly adjacent to each other causes severe co-channel and adjacent-channel interference because the overlapping cells compete for the same spectrum.