Final answer:
Clean and sanitized surfaces should be located above the floor to prevent contamination.
Step-by-step explanation:
To prevent contamination, clean and sanitized surfaces should be located above the floor at a height that minimizes the risk of contact with dirt, dust, and other potential sources of contamination. This height may vary depending on the specific environment and the type of surface. For example, in healthcare settings, clean and sanitized surfaces are typically located at a height of at least 15 to 18 inches above the floor to prevent contact with potentially contaminated items or surfaces.