单项选择题
When you connect an external monitor to your portable computer, the same image appears on both monitors.
You need to drag a window from one monitor to the other.
What should you do?（）
A.A
B.B
C.C
D.D
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A.A
B.B
C.C
D.D -
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Your data recovery strategy must meet the following requirements: ·Back up all data files and folders in C:\Data. ·Restore individual files and folders in C:\Data. ·Ensure that data is backed up to and restored from external media. What should you do?（）
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You need to back up the existing data on a computer before you install a new application. You also need to ensure that you are able to recover individual user files that are replaced or deleted during the installation. What should you do?（）
A.A
B.B
C.C
D.D
