What types of hot work are prohibited until safety requirements are satisfied?

C is the most comprehensive choice because it encompasses all types of activities that can produce heat, sparks, or flames, which can lead to fire hazards in the workplace. Hot work refers to processes such as welding and cutting, which generate high temperatures that can ignite flammable materials nearby. Additionally, spark-producing power tools and chipping operations also fall under hot work, as they can create sparks that might lead to ignition or fires.

Safety requirements must be met to prevent accidents, which usually include ensuring that the work environment is free of flammable materials, proper ventilation, and the presence of fire extinguishing equipment. By prohibiting all these operations—welding, cutting, using spark-producing tools, and chipping—until safety requirements are satisfied, the risk of fire or explosions is significantly reduced.

The other options focus on only one type of operation, omitting critical activities that also pose risks and rely on the same safety protocols, thus providing an incomplete understanding of what constitutes hot work.