What is mandatory when using the "prying method" with heavy equipment?

Using the "prying method" with heavy equipment specifically requires a heavy-duty bucket to ensure safety and operational efficiency. The heavy-duty bucket is designed to withstand the significant forces exerted during the prying process, as this method often involves applying leverage to lift or move heavy materials.

A light-duty bucket might not be sufficiently robust to handle the stresses involved, which could lead to structural failure of the bucket or the equipment itself, creating a hazardous situation. A universal bucket, while versatile, may not provide the necessary durability for heavy-duty tasks. Lastly, not using a bucket at all would be inappropriate in this scenario, as the bucket serves as a crucial tool to enhance the effectiveness of the prying method by providing the necessary grip and leverage.

Thus, the correct choice underscores the importance of using equipment that is specifically suited for the task at hand, particularly when dealing with heavy materials where strength and stability are paramount.