121. What is the purpose of opening the doors and portholes in figure 2 of the illustration

121. What is the purpose of opening the doors and portholes in figure 2 of the illustration

To allow venting of combustion products from the fire to the atmosphere
To allow water used to fight the fire to flow out of the superstructure
To keep the hose teams cool
To provide air flow around the compartment in order to contain the fire

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