Which of the following is NOT a method to prevent static discharge?

Using a hair dryer is not a method to prevent static discharge because hair dryers can actually generate static electricity rather than mitigate it. When airflow over certain materials occurs, such as with a hair dryer, it can lead to the buildup of static charge on those surfaces. The primary goal of static discharge prevention is to limit the accumulation of static electricity, and tools like grounding devices, static sprays, and manned fire extinguishers are designed with that purpose in mind.

Grounding tools help to disperse any static charge safely into the earth, while static sprays are used to reduce friction and minimize the potential for static buildup. Manned fire extinguishers are part of safety protocols in environments where static discharge could ignite flammable materials. Thus, the only option that does not serve the intended purpose of preventing static discharge is the hair dryer, as it could inadvertently contribute to static buildup instead.