Why must UN-specification packaging display specific markings, such as the packaging's UN certification code?

Pick an answer

1. UN markings are purely decorative and unrelated to any testing standard
2. The markings indicate only the packaging's manufacturer name
3. These markings are required only on the outermost layer of packaging, not inner ones
4. The markings confirm the packaging has passed required testing for the type and hazard level of material it will carry

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