What is required for the barbell to be replaced if damaged?

The requirement for the barbell to be replaced if it is damaged is primarily based on conducting a visual assessment of the damage. This option emphasizes the importance of a simple yet effective process where referees or officials visually inspect the barbell for any visible signs of damage that may affect its safety or functionality.

If there are any significant dents, bends, or cracks observed, it indicates that the barbell is no longer fit for use, which ensures the safety of the lifters during their attempts. The visual assessment serves as the immediate first step to determine whether the equipment is safe for competition.

While other options, like barbell certification or detailed inspection, could be relevant in broader contexts or specific circumstances, they do not directly address the immediate need to evaluate the barbell for visible damage during an event. Hence, the visual assessment is the most straightforward and required method for determining if a barbell should be replaced due to damage.