Which option is least appropriate for protecting against arc flash hazards?

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Arc flash protection relies on clothing and PPE that are rated to resist ignition and withstand the heat of an arc, with the level chosen for the expected incident energy. Cotton clothing is the least appropriate because it is not flame resistant and can ignite or melt when exposed to an arc, often causing severe burns and making injuries worse. In contrast, arc-rated flame-resistant clothing is specifically designed to resist ignition and limit heat transfer, reducing burn severity. Eye and face protection, such as arc-rated face shields and safety glasses, protects against the intense light, heat, and flying debris of an arc event. Hazard-rated PPE per task means selecting gear based on the actual energy exposure of the task, ensuring the protection level matches the risk. So cotton clothing fails to provide adequate protection, making it the least appropriate choice.