Which of the following statements about the storage system version upgrade is incorrect?

Which of the following statements about the storage system version upgrade is incorrect?
A . In the system, if the LUN is being formatted, the online upgrade operation cannot be performed.
B . The upgrade operation is not allowed when the current system is undergoing refactoring.
C . Upgrade operation can be done as long as the storage system has no alarms
D . The upgrade operation is not allowed when the current system is undergoing dynamic expansion.

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Answer: C