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?（）

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?（）