Name and describe the three general zones used in re-entry operations and typical access restrictions.

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Zone-based control during re-entry keeps operations safe by separating areas by contamination level and access rights. The cold zone is the clean area used for staging, briefing, and monitoring before anyone enters the more hazardous spaces; it stays free of contaminants and entry is tightly controlled. The warm zone serves as the transition area where decontamination and support functions occur, acting as the bridge between clean and contaminated spaces and requiring appropriate PPE and procedures. The hot zone is the hazard area where the actual risks exist; entry is limited to authorized personnel who are trained and equipped with the proper PPE. This structure prevents contamination from spreading, ensures decon flows are followed, and protects responders while organizing who can go where and when. The other options don’t capture all three zones or their distinct access rules, so they don’t provide the complete, correct framework.