With regard to determining storage layout in support of an email system, which of the following is t

With regard to determining storage layout in support of an email system, which of the following is the most important performance criterion?

A.
Determining mix of heavy versus light users.

B.
Matching the mailbox sizes to LUN capacity.

C.
Matching the number of email users to the number of physical devices.

D.
Identifying average message size and total number sent in a period of time.