How is an event magnitude calculated?

How is an event magnitude calculated?
A . As the sum of the three properties Severity, Credibility and Relevance of the Event
B . As the sum of the three properties Severity, Credibility and Importance of the Event
C . As a weighted mean of the three properties Severity, Credibility and Relevance of the Event
D . As a weighted mean of the three properties Severity, Credibility and Importance of the Event

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Answer: C