You are the network administrator for TestKing. Your network consists of a single Active Directory domain. You manage a Terminal Server farm that includes five terminal servers and a Terminal Services Licensing server named testking9. All servers run Windows 2000 Server. There are 2,500 users who log on to the terminal servers to access a custom human resource (HR) application. You install Windows Server 2003 on a new server named testking10. Testking10 is configured with all default settings enabled. You install Terminal Services and the HR application on testking10. You instruct some users to access the HR application on testking10. Four months later, users report that they can no longer establish Terminal Services sessions to testking10. You verify that users can connect to the other terminal servers in your Terminal Server farm. You need to ensure that users can run the HR application on all terminal servers on the network. What should you do?（）

A. On testking10, set the License Logging service to Automatic, and the start the service.
B. On testking10, install Terminal Service Licensing. Activate the Terminal Services Licensing server.
C. Install Windows Server 2003 on all domain controllers on the network.
Deactivate and activate Terminal Service Licensing on Testking9.