单项选择题 You need to back up your Encrypting File System (EFS) certificate. You must achieve this goal in theminimum amount of time.  What should you do?（）

单项选择题 You have a computer that runs Windows 7. You add a new hard disk drive to the computer and create anew NTFS partition. You need to ensure that you can use the Previous Versions feature on the new drive. What should you do?（）

单项选择题 You have a computer that runs Windows 7. The computer has System Protection enabled. You need toretain only the last System Protection snapshot of the computer. All other snapshots must be deleted.  Whatshould you do?（）