Your company has an Active Directory domain. The company runs Terminal Services. A user has remotely logged on to the Terminal Server. The user requires help to use an application. When you connect to the Terminal Server session， you cannot operate any applications. You need to ensure that you can assist any user on the Terminal Server. What should you do？（）

A. From the Terminal Server run the Tscon /v command. Then reconnect to the session.
B. Run the Chgusr /execute command on the Terminal Server. Then reconnect to the session.
C. Enable Use remote control with default user settings in the RDP-Tcp Properties.
D. Enable Use remote control with the following settings in the RDP-Tcp Properties. Configure the Level of control policy setting to Interact with the session. Instruct the user to log off and log back on.