Who is allowed to work in areas that contain unguarded and uninsulated energized lines or parts of equipment operating at 50 volts or more?

The option indicating that only qualified employees are allowed to work in areas with unguarded and uninsulated energized lines or equipment operating at 50 volts or more is correct because it aligns with safety regulations and industry standards. Qualified employees possess the necessary training and experience to understand the hazards associated with energized electrical equipment and are equipped to take appropriate safety precautions. This includes the ability to recognize and avoid potential electrical hazards, implement safe work practices, and use appropriate personal protective equipment.

In contrast, other groups, such as trained apprentices or unlicensed individuals, might not have the requisite experience or knowledge to safely manage the risks present in these environments. While supervision can enhance safety, the ultimate responsibility lies with those deemed qualified, as they are specifically trained to make informed decisions in potentially dangerous situations. Thus, it's essential for workplace safety that only qualified employees are permitted to operate in such hazardous conditions.