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What is crucial to maintain in a fire extinguisher for it to be effective?

  1. Keeping it in a cool place

  2. Ensuring it is fully charged

  3. Shaking it once a year

  4. Using it regularly for practice

The correct answer is: Ensuring it is fully charged

A fire extinguisher needs to be fully charged in order to be effective in putting out fires. Option A is incorrect because the fire extinguisher should be kept in a dry, easily accessible area, but not necessarily a cool place. Option C is incorrect because shaking it once a year does not have any impact on its effectiveness. Option D is incorrect because practicing with a fire extinguisher can help with proper usage, but it does not affect its effectiveness when actually putting out a fire.