Fact 1: Electrocution causes harm to an organism.

Fact 2: Hair dryers without built-in shock protection devices in the plug can cause electrocution.

Given the two facts above, answer the question "What can be done to make hair dryers safer?" with the following options: 
- remove plastic covering
 - immerse in water
 - heating liquids
 - Add shock protection
 - converting electricity to heat
 - Electric generators
 - a hydraulic system
 - increase current


 

    Add shock protection     