What determines whether a shipment requires placards under the 'any quantity' rule, regardless of how small the load is?

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1. The 'any quantity' rule applies to every hazardous material without exception, regardless of class or type
2. Any quantity rules apply only to liquids, never to solids or gases
3. This rule is determined solely by the shipper's personal preference
4. Certain especially dangerous materials, such as some Class 1 explosives, require placarding at any quantity

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