In a traditional RAID group, when a certain number of hard disks fail, the entire RAID group can prevent data loss, and the data recovery process has not yet started. What is this state?

In a traditional RAID group, when a certain number of hard disks fail, the entire RAID group can prevent data loss, and the data recovery process has not yet started. What is this state?
A . Normal work
B . Demotion
C . Invalidation
D . Refactoring

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Answer: B