Final answer:
In work environments, floors with holes of at least 2 inches in diameter are required to have covers, as a safety measure to prevent falls or injuries.
Step-by-step explanation:
Floors that contain holes which are a minimum of 2 inches in diameter and larger are required to have covers. This safety standard ensures that floors in work environments are safe and free from hazards that can cause trips, falls, or injury. The old rule of thumb used to suggest a space of 5 diameters side to side and 7-8 diameters deep, however, newer guidelines recommend as much as 8 diameters side to side and 15 diameters deep for added safety. Comparing these guidelines to the options provided, the minimum required diameter for a floor hole to need a cover aligns with Option 1: 2 inches.