The concept in legislation that indicates that employers must do everything reasonable to protect the health and safety of workers is referred to as:

The concept that emphasizes employers' responsibility to take all reasonable measures to ensure the health and safety of their workers is known as due diligence. This principle mandates that employers actively engage in necessary precautions, training, and safety measures to create a safe working environment.

Due diligence involves a proactive approach where employers assess risks, implement safety protocols, and continuously monitor and improve workplace safety standards. This concept is crucial in ensuring compliance with health and safety regulations and demonstrates the commitment of an organization to protect its employees from potential hazards.

In contrast, other options revolve around valuable aspects of workplace safety and worker rights but do not encapsulate the comprehensive responsibility of employers for preventative actions. The rights of workers pertain to the legal entitlements that employees have, refusal of unsafe work refers to the right of workers to decline tasks that endanger their safety, and worker's compensation is a system that provides financial support to employees injured at work. While these concepts are significant in promoting a safe work culture, they do not specifically address the overarching duty of employers to implement reasonable safety measures, which is the essence of due diligence.