In the overall deployment mode of the OpenStack single room module, the correct components quantitative proportion as the following are: (Multiple Choice)
A . Relationship between AC and OpenStack is 1:N
B . Relationship between AC and Fabric is 1:N
C . Relationship between the gateway group and the gateway switch is 1:N
D . Relationship between Fabric and Spine/Leaf is 1:1
Answer: ABD