When designing the coverage area for high call capacity, what two actions should be done with data rates and channels?（）

Avoid channels with high AP co-channel interference.
B. Use channels with high AP co-channel interference to avoid channel roams.
C. Set the 2.4-GHz data rate of 5.5 Mb/s to required.
D. Use 5-GHz channels when possible.
E. Use 2.4-GHz channels when possible.