Which of the following represents an essential component of a WHMIS label?

A WHMIS label must include several essential components to ensure the safe handling and use of hazardous materials. One of the key items on a WHMIS label is the safety precautions, which provide crucial information about how to safely work with the substance. This includes guidance on protective equipment required, potential hazards, and emergency measures to take in case of exposure or spills.

Additionally, the supplier contact information is also a vital element of the WHMIS label. This information allows workers and emergency responders to reach out to the supplier for further details about the product or to obtain necessary safety data sheets (SDS).

While a manufacturing date might provide useful information regarding the freshness or validity of a product, it is not a core requirement for WHMIS labeling. Instead, the focus is primarily on safety-related components that promote the safe management of hazardous materials in the workplace.

Thus, since the safety precautions and supplier contact information are both essential, the inclusion of "all of the above" accurately reflects the requirement of a comprehensive WHMIS label.