Why must smoking be prohibited during the loading or unloading of certain hazardous materials, such as flammable liquids?

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1. This rule applies only during loading, not during unloading
2. Smoking has no interaction with any hazardous material during loading
3. A spark or flame near flammable vapors could ignite a fire or explosion
4. Smoking restrictions during loading are purely a matter of company policy, not regulation

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