单项选择题
A.Install the antivirus software on each mailbox storage server
B.Install the antivirus software on each Outlook Web Access server
C.Install the antivirus software on one Outlook Web Access server at each office
D.Install the antivirus software on a back-end server that contains no mailboxes
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单项选择题 Youneedtodesignanadministrativemodelthatmeetsallbusinessandtechnicalrequirements.Whatshouldyoudo？（）