Why does it matter what class of fire extinguisher is mounted on a passenger vehicle?

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1. The class only affects how heavy the extinguisher is, not its effectiveness
2. Any fire extinguisher works equally well on any type of fire
3. Different extinguisher types are rated for different fires, such as electrical or fuel fires, so the wrong type may not put out the actual fire safely
4. The extinguisher class only matters for inspection paperwork, not actual use, since any charged extinguisher will slow a fire regardless of class

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