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

A.
From the Exchange Management Shell, run Set-MailboxDatabase -DumpsterStatisics
$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 database, modify the Deletion Settings.

F.
From the Exchange Management Shell, enable single item recovery.

G.
Create a managed custom folder and managed content setting.

H.
From the properties of a Mailbox server, modify the System Settings.

I.
From the Exchange Management Shell, run the Export-Mailbox cmdlet.

J.
From the properties of the mailbox, enable retention hold.
K.
Create a retention policy and a retention tag.
L.
From the properties of the mailbox, enable litigation hold.
M.
From the properties of the mailbox database, modify the maintenance schedule.

Explanation:
This is not litigation hold as the expired messages must be deleted when the retention period
has elapsed. Litigation hold would keep them indefinitely.

http://technet.microsoft.com/en-us/library/ee364755.aspx
http://technet.microsoft.com/en-us/library/ee633460.aspx
http://technet.microsoft.com/en-us/library/ff660637.aspx