Your company network includes portables computers that have Windows 7 Ultimate and Windows 7 Professional installed.
You want to standardize all portable computers to Windows 7 Professional for Key Management Server (KMS) licensing purpose.

You need to install Windows 7 Professional on all Windows 7 Ultimate portable computers What should you do?

A.
Launch Windows Update

B.
Perform a clean installation over the existing system partition

C.
Perform a clean installation on a non-system partition

D.
Supply the Windows 7 Professional KMS Key

E.
Launch Windows Anytime Upgrade