In FusionCompute, which is the correct about IO ring?
A . The main purpose of turning on I/O ring is maximize the performance of the storage device.
B . In the same cluster, administrators can turn on I/O ring function for some hosts according to their needs.
C . In the same cluster, administrators can turn on I/O rings for some virtual machine according to their needs.
D . Immediately after the I/O ring function is enabled in the same cluster
Answer: A