To extinguish a fire with a portable extinguisher, a person must:

a. both choices are correct.
b. know how to actuate the unit.
c. know how to apply the agent effectively.

The correct answer is A.

Both choices are correct here. In order to extinguish a fire with a portable fire extinguisher you first need to know how to use the thing, how to activate the unit, and then you need to know how to apply the agent to the fire. There are usually instructions placed on the extinguisher for assistance.

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