Active Directory Rights Management Services （AD RMS） is deployed on your network. Users who have Windows Mobile 6 devices report that they cannot access documents that are protected by  AD RMS.   You need to ensure that all users can access AD RMS protected content by using Windows  Mobile 6 devices.  What should you do（）

• A、Modify the security of the ServerCertification.asmx file.
• B、Modify the security of the MobileDeviceCertification.asmx file.
• C、Enable anonymous authentication for the _wmcs virtual directory.
• D、Enable anonymous authentication for the certification virtual directory.