Final answer:
MOPP level 4 is the highest level of protection that requires over garments, boots, masks, and gloves to be worn. It is used in chemical or biological defense situations.
Step-by-step explanation:
MOPP level 4 is when the over garments are worn, boots are worn, mask is worn, and gloves are carried. MOPP (Mission Oriented Protective Posture) levels are used in chemical, biological, radiological, and nuclear defense situations to indicate the level of protection required.
Each MOPP level represents a specific set of protective gear and actions that need to be taken. MOPP level 4 is the highest level of protection and is used when there is a high threat of chemical or biological agents.