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Which type of fire extinguisher is suitable for both Class B and Class C fires?

  1. Water-based

  2. Foam

  3. Class BC

  4. Class ABC

The correct answer is: Class BC

Class BC fire extinguishers are suitable for both Class B and Class C fires. Class B fires involve flammable liquids and gases, while Class C fires involve electrical equipment. Both classes of fire require a non-conductive extinguishing agent, which foam and water-based extinguishers are not. Class ABC fire extinguishers may contain water and cannot be used on electrical fires. Therefore, the Class B and Class C fires cannot be put out with class AB or class A fire extinguishers, making options A, B, and D incorrect.