单项选择题
A.Change the display setting to extend the desktop.
B.In the Microsoft Windows Mobility Center window， turn on the Presentation Settings feature.
C.Configure the external monitor as the primary display and the built-in monitor as the secondary display.
D.Change the secondary display resolution settings to make them equal to or less than the primary display resolution settings.
单项选择题 You delete content from a file named Speed.doc that is stored in the C：\Data folder. You edit 20 files in this folder over the next two days. You need to restore the version of the file that had the correct data. You also need to ensure that the other files in the folder remain unaffected. What should you do？ （）
单项选择题 You need to ensure that you can recover system configuration and data if your computer hard disk fails. What should you do？ （）
单项选择题 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？（）