Who is authorized to modify equipment according to safety standards?

The manufacturer is the correct choice because they possess the original design specifications, engineering knowledge, and safety protocols required to modify equipment. Modifications often require a comprehensive understanding of how equipment functions, as well as the materials and components that meet safety standards. Manufacturers ensure that any changes maintain the integrity and safety of the equipment while adhering to industry regulations.

The user typically does not have the expertise necessary to safely modify equipment, which poses risks. Site supervisors have authority over operations but may not be qualified to make technical modifications to equipment. Any certified technician may have specific skills, but their authority to modify equipment can depend on the policies set by the manufacturer or the overseeing organization. Thus, while other options might seem plausible, only the manufacturer is inherently authorized and equipped to perform modifications in line with safety standards.