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单项选择题

You have an Exchange organization.All servers in the organization have Exchange Server 2010 Service Pack 1 (SP1) installed. You need to ensure that an administrator can recover hard-deleted e-mail messages from a user’s mailbox until the deleted item retention period has elapsed.All expired e-mail messages must be deleted when the retention period has elapsed. What should you do?()

A.From the Exchange Management Shell, run Set-MailboxDatabase -DumpsterStatistics $true.
B.From the properties of the mailbox database, select the This database can be overwritten by a restore check box.
C.From the Exchange Management Shell, run the New-MailboxSearch cmdlet.
D.From the Exchange Management Shell, run the New-MailboxExportRequest cmdlet.
E.From the properties of the mailbox, enable single item recovery.
F.From the properties of the mailbox database, modify the Deletion Settings.

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