The Hazard Communication Standard (HCS) requires which of the following? It is not necessary for the workers to understand the chemicals used at work place. The employers with hazardous chemicals in their workplaces must be trained to handle the chemicals appropriately. The employers with hazardous chemicals in their workplaces must have labels and safety data sheets for their exposed workers. It is not necessary to provide information and training to employees about the hazardous chemicals. Chemical manufacturers and importers are required to evaluate the hazards of the chemicals they produce or import