You have a domain controller named Server1 that runs Windows Server 2008 R2. You need to determine the size of the Active Directory database on Server1. What should you do（）
- ARun the Active Directory Sizer tool.
- BRun the Active Directory Diagnostics data collector set.
- CFrom Windows Explorer， view the properties of the %systemroot%\ntds\ntds.dit file.
- DFrom Windows Explorer， view the properties of the %systemroot%\sysvol\domain folder.