You use a computer that has Windows 7 Professional (32-bit) installed.
You need to migrate the computer to Windows 8.1 Pro (64-bit).
Which installation method should you use?

A.
Start Windows 8.1 custom installation from a DVD.

B.
Open Windows Anytime Upgrade.

C.
Download and run Windows 7 Upgrade Advisor.

D.
Download and run Windows 8.1 Upgrade Assistant.