674. When fighting a fire using a portable carbon dioxide extinguisher, where should the stream be directed to extinguish the fire?

At the base of the flames, moving the horn from side to side
At the center of the flaming area, moving the horn vertically from top to bottom
At the bottom of the flaming area, moving the horn vertically to the top following the flames upward as they diminish
At the top of the flaming area, moving the horn from side to side,

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