A customer reports that their sound is not working. They state that the speakers worked previously. Which of the following should the technician check？（）

• A、Speakers are in regulatory compliance.
• B、Speakers are on and the mute is off.
• C、Ensure the speakers are on the Windows HCL.
• D、Verify the system has enough hard drive space.
• E、The audio driver is installed correctly.
• F、Speakers are plugged into the correct jack.