A Wi-Fi survey finds overlapping 2.4 GHz access points using 20 MHz channels 1, 2, and 3. Which change best reduces adjacent-channel overlap in a US deployment?

1. Hide the SSID on each access point
2. Increase channel width to 40 MHz everywhere
3. Set all access points to maximum power on channel 2
4. Use an appropriate reuse plan based on channels 1, 6, and 11