Your network contains an Active Directory domain named contoso.com.
All user accounts reside in an organizational unit (OU) named OU1.
You create a Group Policy object (GPO) named GPO1. You link GPO1 to OU1. You configure the Group Policy
preference of GPO1 to add a shortcut named Link1 to the desktop of each user.
You discover that when a user deletes Link1, the shortcut is removed permanently from the desktop.
You need to ensure that if a user deletes Link1, the shortcut is added to the desktop again.
What should you do?

A.
Enforce GPO1.

B.
Modify the Link1 shortcut preference of GPO1.

C.
Enable loopback processing in GPO1.

D.
Modify the Security Filtering settings of GPO1.

Explanation:
Replace Delete and recreate a shortcut for computers or users. The net result of the Replace action is to
overwrite the existing shortcut. If the shortcut does not exist, then the Replace action creates a new shortcut.
This type of preference item provides a choice of four actions: Create, Replace, Update, and Delete. The
behavior of the preference item varies with the action selected and whether the shortcut already exists.

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http://technet.microsoft.com/en-us/library/cc753580.aspx