You have an Exchange organization. All Servers in the organization have Exchange Server 2010 SP1 installed.

You need to ensure that you can restore a mailbox deleted from a mailbox database if the mailbox was deleted up to six months earlier the solution must not require a database backup.

What should you do?

A.
create a managed custom folder and managed content settings.

B.
from the Exchange Management Shell, run the New-MailboxExportRequest cmdlet.

C.
from the Exchange Management Shell, run Set-MailboxDatabase -DumpsterStatistics $true.

D.
from the Exchange Management Shell, run the Export-Mailbox cmdlet.

E.
create a retention policy and a retention tag.

F.
from the properties of the mailbox database, modify the Deletion Settings.

G.
from the properties of the mailbox database, select the This database can be overwritten by a restore check box

H.
from the properties of the mailbox database, modify the maintenance schedule.

I.
from the properties of the mailbox, enable litigation hold.

J.
from the properties of the mailbox, enable retention hold.
K.
from the Exchange Managent Shell, run the New-MailboxSearch cmdlet.
L.
from the properties of a Mailbox server, modify the System Settings.
M.
from the properties of the mailbox, enable single item recovery.

Explanation:
Conflicting answers on this one, for me its straight forward, deletion settings on the Limits tab for mailbox databases.
(Exhibit)