In the deployment or expansion scenario, alarm reversal can reverse the alarm state and reduce a large number of unnecessary alarm reports. Which of the following descriptions about alarm reversal is correct?

In the deployment or expansion scenario, alarm reversal can reverse the alarm state and reduce a large number of unnecessary alarm reports. Which of the following descriptions about alarm reversal is correct?
A . The setting of alarm reversal is based on the channel
B. The setting of alarm reversal is based on the network element
C. The setting of alarm reversal is port-based
D. The setting of alarm reversal is based on the board

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Answer: C