What must responders do when identifying an unknown material?

Answer: A — Follow the assessment protocol and avoid direct contact

Following the assessment protocol and avoiding direct contact is crucial when identifying an unknown material. This approach ensures the safety of first responders, as unknown substances may pose significant health and safety risks, including toxicity, flammability, or reactivity. By adhering to established protocols, responders can systematically gather information about the scene, assess potential hazards, and implement appropriate safety measures. Avoiding direct contact minimizes the risk of exposure to harmful substances, which can have immediate and long-term health consequences. Proper assessment involves using available resources, such as safety data sheets (SDS), hazardous materials databases, and other identification methods, all while maintaining a safe distance from the substance. This cautious approach is fundamental to protecting both the responders and the public in situations involving hazardous materials. The other options do not prioritize safety as effectively. Attempting to smell the material involves direct contact and poses significant health risks, while conducting tests immediately without proper safeguards could lead to dangerous situations. Reporting without taking any preparatory measures also lacks the necessary framework for ensuring responder safety.