You have a computer that runs Windows Vista (x86). You need to perform a clean installation of Windows 7(64-bit). 
	What should you do?()
	A.From the Windows 7 installation media, run Rollback.exe.
	B.From the Windows 7 installation media, run Migsetup.exe.
	C.Start the computer from the Windows 7 installation media. From the Install Windows dialog box, select the Upgrade option.
	D.Start the computer from the Windows 7 installation media. From the Install Windows dialog box, select the Custom (advanced) option.
 
                            