Which recommendation should be followed when performing location calibration? Select the best response

Which recommendation should be followed when performing location calibration? Select the best response.

A.
Calibration exercise should be completed in an empty,nonpopulated environment.

B.
Dynamic RRM AP power mode should be disabled on the Cisco WLC where calibration is being performed.

C.
Both Cisco Compatible Extensions and non-Cisco Compatible Extensions devices should be used for greater calibration accuracy.

D.
Maximum of 50 data points should be collected.