What should you do?

Your network contains a server that has Microsoft SharePoint Foundation 2010 installed. You discover that the SharePoint database has a large amount of unused space. You need to reduce the amount of unused space in the database.
What should you do?

A.
From Central Administration, run the farm configuration wizard.

B.
From Microsoft SQL Server Management Studio, use the Object Explorer.

C.
From the SharePoint 2010 Management Shell, run the Set-SPContentDatabase cmdlet.

D.
At the command prompt, run the stsadm.exe command and specify the mergecontentdbs parameter.