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?

A.
Run the Active Directory Sizer tool.

B.
Run the Active Directory Diagnostics data collector set.

C.
From Windows Explorer, view the properties of the %systemroot%\ntds\ntds.dit file.

D.
From Windows Explorer, view the properties of the %systemroot%\sysvol\domain folder.