Which of the statement about OceanStor V3 storage system tuning process is wrong?

Which of the statement about OceanStor V3 storage system tuning process is wrong?
A . need to understand the business (applications and data, etc.), specific tuning goals.
B . after tuning all systems involved in performance bottlenecks configuration parameters, and then determine whether the tuning goals is completed.
C . before tuning to be backed up business systems and data.
D . process monitoring and analysis of the business performance data, confirm the performance bottlenecks and analyze the root cause.

Answer: B