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------------------------------------------------ Used on electrical fires. Contains potassium bicarbonate or potassium chloride that can leave a sticky residue and irritate the skin and eyes.

A. Class A fire extinguisher
B. Class B fire extinguisher
C. Class C fire extinguisher
D. Class D fire extinguisher

The extinguisher mentioned, which uses potassium bicarbonate or potassium chloride, is a Class C fire extinguisher, used specifically for electrical fires.Thus the option C Class C fire extinguisher is the correct answer.

Explanation:

The fire extinguisher described in the question is a Class C fire extinguisher, which is used on electrical fires. It contains potassium bicarbonate or potassium chloride, which can leave a sticky residue and may irritate the skin and eyes upon contact. This type of extinguisher is specifically designed to tackle fires involving electrical equipment where the electrical non-conductivity of the extinguishing agent is crucial. Alternatively, Class D fire extinguishers are used for combustible metal fires, such as magnesium or sodium, which react with water.