What type of fire extinguisher rating is generally appropriate for the range of fire risks (fuel, electrical, ordinary combustibles) present on a passenger vehicle?

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1. Extinguisher rating is irrelevant as long as one is present on board, since any extinguisher is assumed to slow down a fire regardless of class
2. An extinguisher rated only for paper and wood fires
3. A multi-purpose rated extinguisher capable of handling more than one class of fire
4. A water-only extinguisher, regardless of the fire's cause

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