Answer: 6 inches
Step-by-step explanation:
There are food and safety guidelines that is made available for the people to keep the food clean and safe for eating.
The shelves must be made at a height of 6 inches from the ground so that the space that is under the shelves can be cleaned properly.
This much space is the minimum which has to be there to get it cleaned properly. This will ensure fresh food and will not be infected by bacteria by contamination.