In Huawei Cloud Stack, the user found that the cloud hard disk I/O of an elastic cloud server was slow in reading and writing, and the virtual machine business operation was damaged. Which of the following troubleshooting methods is most suitable at this time?

In Huawei Cloud Stack, the user found that the cloud hard disk I/O of an elastic cloud server was slow in reading and writing, and the virtual machine business operation was damaged. Which of the following troubleshooting methods is most suitable at this time?
A . Health inspection
B . Cloud platform fault diagnosis (call chain)
C . ECS storage fault diagnosis
D . ECS network fault diagnosis

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Answer: C