You have a netbook computer that runs Windows 7. The computer has a single 30-GB partition that has 10GB of free space. You need to create a system image of the computer by using Windows Backup. You mustachieve this goal by using the minimum amount of time. <br /> What should you do first?()
A、Attach an external hard disk.
B、Attach an external DVD burner.
C、Convert the local hard disk to a GPT disk.
D、Create and attach a virtual hard drive (VHD).