Which statement about wireless LAN security is true?

Which statement about wireless LAN security is true?

A.
Cisco CleanAir is a technology that allows you to detect the distance of a wireless device
from an access point.

B.
Cisco Aironet 3500 and 3600 Series Access Points do not have an integrated spectrum
analyzer that detects interferers.

C.
Classification occurs at the access point; interference impact and data are then sent to
the wireless LAN controller.

D.
The wireless LAN controller stores data for location, history, and troubleshooting
purposes.

Explanation: