What is the most likely reason for this result?

You performed a site survey with two USB Wi-Fi adapters using a special driver written for the site survey software. After deployment, you realized that the client devices used by your customer are getting lower RSSI values than that shown during your site survey.

What is the most likely reason for this result?
A . USB Wi-Fi adapters designed for site surveys may have better sensitivity than regular Wi-Fi cards installed in client devices.
B . The transmit power on the APs is higher than needed.
C . Regular Wi-Fi cards installed in client devices do not support the same protocols as survey adapters.
D . USB Wi-Fi adapters have a greater sensitivity than internal Wi-Fi adapters.

Answer: A