单项选择题 A user is reporting that they are getting pop-ups while they are not actively browsing the Internet.Which of the following would BEST resolve this issue?（）

单项选择题 A technician is testing a power supply for correct output voltages at the HDD power connector. Which of the following voltages should the technician expect for a correctly working power supply?（）

单项选择题 A customer reports that error messages occasionally appear and quickly disappear. Which of thefollowing is the BEST place for a technician to begin troubleshooting this issue?（）