Which is the proper method of determining whether a portable CO2 fire extinguisher needs recharging?()
A. Check the tag to see when the extinguisher was last charged
B. Release a small amount of CO<sub>2</sub> if the CO<sub>2</sub> discharges,the extinguisher is acceptable
C. Weigh the extinguisher and compare the weight against that stamped on the valve
D. Recharge the extinguisher at least once each year