What strategy can be used to ensure efficient cell overlap for VoIP site surveys?

What strategy can be used to ensure efficient cell overlap for VoIP site surveys?
A . Measure the percentage of cell overlap using the cell overlap feature in the site survey software.
B . Increase the output power of the radio in all APs.
C . Install higher gain antennas in the APs.
D . Ensure at least two APs can be seen with appropriate signal strengths from each location.

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Answer: A