You need to prevent a user named User1 from permanently deleting an email message in his mailbox

You have an Exchange Server 2013 organization. You need to prevent a user named User1
from permanently deleting an email message in his mailbox. What should you do on the
mailbox of User1?

A.
Implement a retention policy.

B.
Configure a retention hold.

C.
Implement a data loss prevention (DLP) policy.

D.
Configure an in-place hold.