单项选择题 Which of the following access levels allows a user to perform normal day to day work with their own files but does not allow them to change system files or computer performance?（）

单项选择题 Malware is removed and a computer is rebooted. Later, the malware is found on the computeragain. Which of the following would permanently solve this problem?（）

单项选择题 A floppy drive is replaced in a computer and now when the computer is turned on the floppy drive light is constantly lit. Which of the following is the MOST likely cause?（）