For ease of cleaning, floors, walls, and other surfaces should be designed so that they are which of the following?

The best choice focuses on the qualities that make surfaces easier to clean and maintain, which are durability and smoothness. Durable surfaces are essential in food environments because they can withstand heavy foot traffic, spills, and rigorous cleaning without degrading. Smooth surfaces facilitate cleaning by preventing food particles and contaminants from becoming trapped in crevices or rough textures. This combination minimizes the risk of bacterial growth and makes routine cleaning efforts more effective.

While other options mention specific qualifications like FDA approval or NSF listing, the primary focus in food safety is on the physical properties of the materials used. NSF (National Sanitation Foundation) listing indicates that a product meets certain safety and cleanliness standards, and having FDA approval suggests that the materials are safe for food contact. However, these certifications alone do not guarantee that a surface will be easy to clean, which makes durability and smoothness the most critical factors in this context.