Final answer:
Workers at heights of 6 feet or more must use a Guardrail System with toeboards, Safety net system, or Personal fall arrest system (PFAS) for fall protection, as mandated by OSHA.
Step-by-step explanation:
Workers engaged in roofing activities at heights of 6 feet or more must be protected from falling by one of the following systems: a Guardrail System with toeboards, a Safety net system, or a Personal fall arrest system (PFAS). These safety measures are required by the Occupational Safety and Health Administration (OSHA) to help prevent workplace injuries and fatalities. OSHA's standards require that employers provide the necessary fall protection equipment and ensure it is used properly to safeguard their employees against falls from heights. The equipment serves to prevent serious hazards, including those that can occur when working at elevated levels.