单项选择题

A.AB.BC.CD.DYour computer runs Microsoft Windows XP Pro……

Your computer runs Microsoft Windows XP Professional. The computer also runs 20 third- party applications. You plan to upgrade your computer to Microsoft Windows Vista. The functionality of the existing applications must be maintained even after you upgrade your computer. You need to ascertain whether the hardware and software on the Windows XP Professional computer will support the upgrade.
What should you do?（）

A.A
B.B
C.C
D.D

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