Site survey results show negligible foreign WiFi and non-WiFi interference. What is the best method to decrease duty cycle (radio frequency utilization) and increase overall wireless LAN client performance for this design?

11a, 802.11g, and 802.11n mode wireless LAN clients

Site survey results show negligible foreign WiFi and non-WiFi interference. What is the best method to decrease duty cycle (radio frequency utilization) and increase overall wireless LAN client performance for this design?
A . Disable all data rates below 12 Mb/s on all access points.
B . Decrease radio transmit power on all access points that report a high duty cycle.
C . Increase radio transmit power on all access points that report a high duty cycle.
D . Disable all data rates above 12 Mb/s on all access points.
E . Increase radio transmit power on all access points.

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Answer: A