After importing a floor plan to a predictive design tool, what should be done prior to adding APs, antennas and attenuators (e.g., walls)?

After importing a floor plan to a predictive design tool, what should be done prior to adding APs, antennas and attenuators (e.g., walls)?
A . Set the transmit power for all APs
B . Add pictures of the environment
C . Nothing; just begin by adding APs, antenna and attenuators
D . Calibrate the floor plan to increase accuracy

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Answer: D