Which technician correctly states the certification requirements for R-12 air-conditioning?

In the context of certification requirements for R-12 air-conditioning systems, the correct response reflects the regulations that govern the handling of refrigerants. To work on systems containing R-12, technicians must be certified under the rules established by the Environmental Protection Agency (EPA). This certification typically involves proving knowledge and understanding of safe handling practices, compliance with environmental regulations, and the implications of releasing refrigerants into the atmosphere.

When both A and B affirm the necessary requirements for certification, it indicates that each statement contributes valid information that together encapsulates the entire scope of what is necessary. This collaboration ensures that technicians not only have the theoretical knowledge but also the practical guidance needed to avoid environmental hazards associated with R-12. Thus, the inclusion of both A and B signifies a comprehensive acknowledgment of the certification standards in place for R-12 air-conditioning, leading to the conclusion that both are correct.

Choosing this option illustrates an understanding that certification is multifaceted and should encompass various necessary aspects for effective and responsible practice in the industry.