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• What number in the blue, red, or yellow section of an NFPA diamond or HMIS label identifies the highest hazard?A. 1B. 2C. 3D. 4A. The number 4 indicates the highest hazard for the blue, red, or yellow sections of an NFPA diamond or HMIS label. The blue section is used for health hazards, flammability hazards are identified in the red section, and instability hazards are in the yellow section.Assessment Quiz