Which of the following statements about region is correct ()? (Select 3 Answers)

Which of the following statements about region is correct ()? (Select 3 Answers)
A . APs belonging to the same region will uniformly adjust the radio frequency channel and power
B . An AP can belong to two regions at the same time, so that roaming is more optimized
C . If there is no configuration, all APs belong to region 0 by default
D . AP region has three types of deployment: dense deployment, discrete deployment, and ordinary deployment.

Answer: A,C,D