You are installing an application on a computer that runs Windows Server 2008. During installation， the application will nedd to install new attributes and classes to the Active Directory database. You need to ensure that you can install the application. What should you do（）

• A、Change the functional level of the forest to WIndows Server 2008.
• B、Log on by using an account that has Server Operator rights.
• C、Log on by using an account that has Schema Administrator rights and the appropriate rights to install the application.
• D、Log on by using an account that has the Enterprise Administrator  rights and the appropriate rights to install the application.