Final answer:
Floor holes require guardrails, while wall openings must have warning signs.
Step-by-step explanation:
According to OSHA, there is a difference between floor holes and wall openings. Floor holes require guardrails to prevent falls, while wall openings must have warning signs to alert workers to the potential hazard. The purpose of guardrails is to provide a physical barrier that prevents workers from accidentally stepping into a floor hole. On the other hand, warning signs for wall openings help workers identify and navigate around the opening, reducing the risk of injury.