When using carbon dioxide to fight a fire on a bulkhead,the CO2 should be applied().
A. first to the bottom of the flaming area,sweeping from side to side,and following the flames upward
B. in a circular motion from the middle of the bulkhead outward
C. to the top of the flaming area,sweeping from side to side,and working toward the bottom
D. in an up-and-down motion from one side of the bulkhead to the other