Which of the following is NOT a recommended fire extinguishing method?

The choice of water buckets as a fire extinguishing method is not recommended, particularly in the context of welding and similar operations where there are specific hazards present. While water can be effective for certain types of fires, it can also exacerbate others, especially flammable liquids and electrical fires. The nature of the materials being welded often includes metals and other components that may react negatively with water, potentially leading to dangerous situations such as explosions or spreading the fire.

In contrast, the other methods listed - fire hoses, fire-resistant blankets, and sand buckets - are more effective and appropriate for diverse situations. Fire hoses can deliver a significant amount of water quickly, fire-resistant blankets can smother flames and prevent them from spreading, and sand buckets can cover and extinguish fires involving flammable materials by cutting off the oxygen supply. Each of these options has a specific use case that makes it suitable for handling fire accidents in environments like welding shops.