What is the advantage of CO₂ over dry chem extinguishers?
1) CO₂ extinguishers are more effective in extinguishing electrical fires.
2) CO₂ extinguishers leave no residue after use.
3) CO₂ extinguishers are suitable for use on flammable liquids.
4) CO₂ extinguishers are non-toxic and safe for use in confined spaces.