The IEEE 802.11 (as amended) Dynamic Frequency Selection (DFS) service is capable of performing what functions?

A.
Establishing a interference baseline on all 2.4 GHz channels

B.
Using modulation switching techniques to avoid interfering with radar systems

C.
Testing channels for radar before using a channel and while operating in a channel

D.
Suspending operations on a channel with high IEEE 802.11 co-channel interference

E.
Requesting and reporting of measurements in the current and other channels