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.
