Certified Safety Professional Practice Exam

Class 4 lasers are classified as high-powered lasers that can indeed cause significant injuries to the skin and eyes due to their intense light and energy output. These lasers have the potential to cause severe burns and permanent eye damage upon direct exposure.

Understanding the attributes of Class 4 lasers is essential for safety protocols, especially in environments where lasers are used. It's important to recognize that because of their power, they require specific safety measures and protective gear to prevent accidents that can lead to serious injuries. In practical applications, such as in medical, industrial, and research settings, the potential hazards posed by Class 4 lasers necessitate a strong focus on safety, emphasizing why option B accurately reflects a critical characteristic of these lasers.

The incorrect choices highlight misconceptions about Class 4 lasers; they don't have a power limit under 100 mW, they can pose fire hazards under certain conditions due to their capability to ignite materials, and thus, they do not fit the description of being completely safe from such risks.