A wireless engineer is calibrating a floor using Cisco Prime Infrastructure. Which setting in the WLC must be disabled before the floor calibration is started?

CleanAir classifies and reports RF interference sources but does not alter AP transmit power, so it has no effect on the consistency of calibration signal measurements.

Dynamic Channel Assignment (DCA) reassigns RF channels to reduce co-channel interference but does not change transmit power levels, so leaving it enabled does not invalidate calibration data.

Coverage Hole Detection is a passive monitoring and alerting feature that reports weak-coverage areas; it does not modify AP transmit characteristics and therefore does not need to be disabled before calibration.

Tx Power Control (TPC) is a RRM feature that dynamically lowers or raises AP transmit power in response to neighbor AP conditions. If TPC is active during calibration, power levels change unpredictably, corrupting the signal-strength readings that Prime Infrastructure uses to build an accurate RF model. Disabling TPC forces all APs to transmit at a static power level, ensuring consistent and repeatable measurements.