You have an Exchange Server 2010 Service Pack 1 (SP1) Mailbox server named Server1.

You need to ensure that a copy of each email message modified or deleted by a user named User1 is retained on Server1.

What should you do?

A.
Create a personal tag.

B.
Enable single item recovery.

C.
Enable message tracking.

D.
Enable litigation hold.

E.
Create a retention policy.

F.
Create a journal rule.

Explanation:
Reference:

http://technet.microsoft.com/en-us/library/ee861123.aspx