What is the formula for a standardized agent count for email?

What is the formula for a standardized agent count for email?
A . Standardized agent count for email = Actual agent count * Average number of messages handled per hour by each agent / 10
B. Standardized agent count for email = Actual agent count * Average number of messages handled per hour by each agent / 6
C. Standardized agent count for email = Actual agent count * Average number of messages handled per hour by each agent / 20
D. Standardized agent count for email = Actual agent count * Average number of messages handled per hour by each agent / 4

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Answer: C