When a device is abnormal or fails, it will generate a variety of information. According to the severity or urgency of the information, the information is divided into 8 levels. Which of the following has the highest severity level?

When a device is abnormal or fails, it will generate a variety of information. According to the severity or urgency of the information, the information is divided into 8 levels. Which of the following has the highest severity level?
A . Informational
B . Debugging
C . Notification
D . Warning

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Answer: D