Your network contains an Active Directory domain named contoso.com. All domain controllers run Windows Server 2012 R2. You create and enforce the default AppLocker executable rules. Users report that they can no longer execute a legacy application installed in the root of drive C. You need to ensure that the users can execute the legacy application. What should you do？（）

A. Modify the action of the existing rules
B. Create a new rule.
C. Add an exception to the existing rules
Delete an existing rule