Answer :
Final answer:
When a roof is being repaired, a fire extinguisher rated for Class A for ordinary combustibles and Class B for flammable liquids and gases should be present as a safety precaution.
Explanation:
When a roof is being repaired, it is crucial to have at least one fire extinguisher present as a safety precaution. The type of fire extinguisher to be used depends on the materials and the potential fire class that could occur.
For most general types of fires that might happen during roof repairs, which may involve ordinary combustibles or flammable liquids, the appropriate type of fire extinguisher would be rated for Class A and Class B fires. Therefore, the correct answer is a fire extinguisher rated Class A for ordinary combustibles such as wood, paper, and most plastics, and Class B for flammable liquids and gases.
