Answer:
A, B and D
Explanation:
Under OSHA laws, employers must provide a safe workplace for the employees. All the danger areas must be indicated with either painting or signage. Using guard rails is an excellent way of demarcating danger zones. They keep employees away from dangerous spots. In this case, an employer should use guard rails in the following circumstances.
1.Around every floor hole into which a worker can accidentally walk. The guard rails will form a barrier that will prevent accidental falls into the hole.
2.Around every open-sided platform, floor, or runaway that is 4 feet or higher off the ground or next level. The guard rails form a wall that prevents employees in raised levels from falling to the ground.
3. Regardless of height, if a worker can fall into dangerous machines or equipment. In case of an incident, the guard rails will stop an employee from falling into dangerous machines or equipment.
