What does NFPA 1951 standardize?

NFPA 1951 specifically addresses the requirements for protective ensembles used in technical rescue situations. This includes gear designed to protect rescuers during operations that may involve environments or incidents such as water rescue, confined space, and structural collapse. The standard emphasizes factors like design, performance, and testing criteria for these protective ensembles to ensure the safety and effectiveness of responders in hazardous situations.

The other choices relate to different NFPA standards or areas of emergency response that are not covered by NFPA 1951. For example, fire prevention strategies would generally be governed by different NFPA standards focused on fire safety practices, while emergency medical response equipment would fall under standards dedicated to medical gear and practices. Similarly, hazardous materials handling is covered by its own standards, emphasizing containment and safety when dealing with toxic substances. Thus, NFPA 1951 is specifically tailored to the unique requirements of protective clothing and gear in technical rescue operations, making it the correct answer.