Which step is more when the the single board replacement operation of main control board single configuration than main control board double configuration?

Which step is more when the the single board replacement operation of main control board single configuration than main control board double configuration?
A . Download the original configuration data
B . Ensure that the version of the host software is the same before and after the replacement.
C . Consistency check of network management and network element data.
D . Query the alarm of the board and confirm that the original alarm has been cleared.

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Answer: A