Which of the following best describes placarding?

Placarding refers to the placement of warning labels on containers that hold hazardous materials. This is a critical component of safe transportation and handling of hazardous substances, as placards provide vital information about the nature of the materials and the risks they pose. By using specific colors, symbols, and numbers, placarding helps ensure that those who are working with or around these materials are aware of the potential hazards and can take appropriate safety precautions.

While shipping costs, labeling non-hazardous materials, and the supervision of hazardous waste disposal are relevant to the broader context of hazardous materials management, they do not accurately define placarding. The primary function of placarding is related to warning and communicating the inherent dangers associated with hazardous materials during transport and storage.