单项选择题 On which of the following hard drive types must Bob, a technician, change the jumper setting to match the motherboard/cabling combination?（）

单项选择题 A department of users is reporting there are lines across their printouts. They have alreadychanged the toner cartridge but the issue remains. Which of the following is the BEST item for Karen, a technician, to inspect?（）

单项选择题 How many volts does a power supply’s 4-pin Molex connector carry to internal devices?（）