You are the network administrator for . The network consists of asingle Active Directory domain named. All network servers run Windows Server 2003. Terminal Services is installed on your network. You currently use a terminal server farm. Testking1, the first server in the farm, acts as the session directory server. All terminal servers are operating at maximum capacity. An increasing number of users report slow response times when they use these servers. You need to improve the performance of the terminal server farm. You plan to use a server named Testking4, which has hardware identical to that of the other terminal servers in the farm. First, you add Tesking4 to the Session Directory Computers group on Testking1. What should you do next?（）

Add Testking4 to the Session Directory Computers group on the PDC emulator.
B. On Testking4, select the Terminal Services configuration option to join the existing session directory.
C. On Testking4, install the Session Directory service.
D. On Testking4, create a new session directory server.