Your network contains a server named Server1 that runs Windows Server 2008 R2. On Server1， you create an Active Directory Lightweight Directory Services （AD LDS） instance named Instance1. You connect to Instance1 by using ADSI Edit. You run the Create Object wizard and you discover that there is no User object class. You need to ensure that you can create user objects in Instance1. What should you do（）

A. Run the AD LDS Setup Wizard.
B. Modify the schema of Instance1.
C. Modify the properties of the Instance1 service.
D. Install the Remote Server Administration Tools （RSAT）.