Which of the following, if required, must the shipper put on the package?

The correct answer encompasses the requirements mandated by the Department of Transportation (DOT) regulations regarding hazardous materials packaging. When shipping hazardous materials, there are strict guidelines that must be followed to ensure both safety and compliance.

The required label is essential because it visually communicates the nature of the hazardous material, allowing handlers to identify the potential risks associated with the package. The hazardous materials shipping name and identification number (typically the UN number) are also crucial, as they provide detailed information about the specific type of hazardous material being shipped, aiding in proper handling and emergency response if an incident occurs.

In addition, including the name and address of the shipper or consignee is important for traceability and communication purposes. This information ensures that in case of any issues during transportation, the responsible parties can be identified quickly and effectively.

Given that all of these elements serve critical roles in the safe and compliant transport of hazardous materials, each one is required by regulation when applicable, making the comprehensive response the correct choice.