单项选择题 You have a computer that runs Windows XP and a USB drive that is protected by using BitLocker To Go.You need to ensure that you can copy files from the computer to the USB drive. The solution must retain theexisting files on the USB drive.  What should you do?（）

单项选择题 You have a portable computer that runs Windows 7. The computer is joined to a domain. Multiple users logon to the computer. You need to prevent the computer from displaying the username of the last user whologged on. What should you do？（）

单项选择题 You have a standalone computer that runs Windows 7. Multiple users share the computer. You need toensure that you can read the content of all encrypted files on the computer.  What should you do?（）