A Graphics Designer Complains That He No Longer Hears Sound

A graphics designer complains that he no longer hears sound when playing music or watching a video online on his computer. You confirm the speakers are plugged in and nothing is muted. Before replacing the sound card, what are two options to pursue to make sure the card isn't defective?

A) Device Manager - verify the sound card is enabled
B) Admin Tools - Services - verify Sound (service) is running
C) Device Manager - update sound card drivers
D) Event Viewer - Application log