单项选择题 A user reports their laptop computer can no longer connect to a server. The computer works correctly in a different office. Which of the following tools would be used to troubleshoot this issue?（）

单项选择题 A user reports that a network printer will not print, however, other users are not experiencing any problems. The user has rebooted their computer twice and it is still not printing. Which of the following should the technician check?（）

单项选择题 Recently three new applications were installed on all the desktops in a company branch. One of the applications causes Windows to crash on startup, but the technician is unable to find out which application it is. Without removing all three applications, which of the following is the BEST way to determine the cause of the crash?（）