Which of the following statements replacing the storage array controller is wrong?

Which of the following statements replacing the storage array controller is wrong?
A . Before plugging and unplugging the controller, make sure that the service is stopped or has switched to the peer controller
B . Before switching services to the peer controller, check that the multipathing software in the system is installed and effective on the host.
C . Confirm Cache dirty data has been saved
D . Master-slave controller must be switched to be replaced controller for backup

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Answer: B