Why is it important that the identification number listed on shipping papers matches the format required (with the correct prefix, such as UN or NA)?

Pick an answer

1. Any four-digit number is acceptable regardless of prefix
2. Prefix accuracy matters only for shipments crossing international borders
3. The correct prefix and number combination is what responders use to look up specific guidance for that exact material
4. The prefix has no functional purpose and is purely a formatting convention left over from older paperwork systems

Correct!

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