Question: How do you dust a desktop computer?

  Options: 
 A. First, you need to turn off the computer and unplug it from the wall. Then, you need to open the side panel and, using a can of compressed air, blow the dust out of your computer. Finally, close the side panel back and plug the computer.
 B. First, you need to turn off the computer and unplug it from the wall. Then, using a can of compressed air, blow the dust around in your computer. Finally, plug the computer back in the wall and power it on. It should now be very dusty.
Answer: A