Which of the following does OSHA NOT regulate?

The correct answer is that OSHA does not regulate employee salaries. The primary purpose of the Occupational Safety and Health Administration (OSHA) is to ensure safe and healthy working conditions by enforcing standards related to workplace safety and health issues. This includes regulating work conditions, safety equipment usage, and construction practices to prevent workplace accidents and injuries.

Employee salaries, however, fall under the domain of labor law and are generally governed by market conditions, negotiations between employers and employees, and compliance with regulations concerning minimum wage and overtime laws, rather than OSHA’s safety-focused mandate. Thus, OSHA's regulations do not extend to salary determination or compensation practices.