You are the network administrator for The network consists of a single Active Directory domain named All network servers run Windows Server 2003. Confidential files are stored on a member server named TK1. The computer object for TK1 resides in an organizational unit (OU) named Confidential. A Group Policy object (GPO) named GPO1 is linked to the Confidential OU. To audit access to the confidential files, you enable auditing on all private folders on TK1. Several days later, you review the audit logs. You discover that auditing is not successful. You need to ensure that auditing occurs successfully. What should you do?（）

• A、Start the System Event Notification Service (SENS) on TK1.
• B、Start the Error Reporting service on TK1.
• C、Modify the Default Domain Controllers GPO by selecting Success and Failure as the Audit Object Access setting.
• D、Modify GPO1 by selecting Success and Failure as the Audit Object Access setting.