单项选择题 Which of the following should be used to restrict access to a wireless network?（）

单项选择题 After setting up a new computer, a user states that the mouse and keyboard will not work. Whichof the following is the MOST likely reason?（）

单项选择题 Windows XP mode on a Windows 7 Professional machine fails to load. Which of the following isMOST likely the cause?（）