Your company has a single Active Directory directory service forest with three domains. You plan to modify the Active Directory schema. You need to identify the schema master for the forest.  What should you do？（）

• A、 Run the regsvr32 schmmgmt.dll command. Use the Active Directory Domains and Trusts snap-in. 
• B、 Run the regsvr32 schmmgmt.dll command. Use the Active Directory Users and Computers snap-in. 
• C、 Use the Dsget command-line tool.
• D、 Use the Dsquery command-line tool.