Final answer:
The clearance between the bottom of a portable fire extinguisher and the floor must be at least 24 inches.
Step-by-step explanation:
The clearance between the bottom of a portable fire extinguisher and the floor must be at least 4) 24 inches. This requirement ensures that there is enough space for the extinguisher to be easily accessed and maneuvered in case of an emergency. Having a larger clearance also helps prevent obstruction and allows for proper visibility of the extinguisher.