Fact 1: The vanes rotating in an electric fan causes air to move.

Fact 2: Many computer Cases cool down temperature by using Cooling Fan.

Given the two facts above, answer the question "Rotating vanes move air to do what to a computer?" with the following options: 
- cool it
 - improve
 - heat
 - stop it
 - dangerous
 - launch it
 - warm it
 - wind


 

 cool it        