When Huawei Cloud tenants create AS elastic scaling groups, which of the following strategies does the AZ to which ECS belongs support? (Multiple Choice)

When Huawei Cloud tenants create AS elastic scaling groups, which of the following strategies does the AZ to which ECS belongs support? (Multiple Choice)
A . Specify AZ selection priority in single Region
B . All AZ selection priority in single Region
C . All AZ-uniform distribution under a single Region
D . Specify AZ-uniform distribution under a single Region

Answer: ABCD