You are the network administrator for your company. The network consists of a single Active Directory domain. All network servers run Windows Server 2003. Half of the client computers run Windows XP Professional, and the other half run Windows NT 4.0 Workstation. You install Terminal Server on five member servers named Server1 through Server5. You place all five terminal servers in an organizational unit (OU) named Terminal Server. You link a Group Policy object (GPO) to the Terminal Server OU. Two days later, users notify you that the performance of Server4 is unacceptably slow. You discover that Server4 has 75 disconnected Terminal Server sessions. You need to configure all five terminal servers to end disconnected sessions after 15 minutes of inactivity. You must achieve this goal by using the minimum amount of administrative effort. What should you do（）?

A. Log on to the console of each terminal server. In the RDP-Tcp connection properties, set the End a disconnected session option to 15 minutes.
B. Edit the GPO to set the time limit for disconnected sessions to 15 minutes.
C. On Server1, run the tsdiscon command to disconnect all 75 users from Server4.
D. In Active Directory Users and Computers, set the End a disconnected session option for all domain user accounts to 15 minutes.