Coving is defined as:

Coving refers specifically to the curved or angled transition between floors and walls. This design feature helps to eliminate sharp corners where dirt and debris can accumulate, making it easier to clean and maintain sanitary conditions. By ensuring that there are no crevices between the floor and the wall, coving helps to minimize the risk of pest harborage and provides a seamless surface for cleaning, which is especially important in food preparation and storage areas.

The other options do not accurately describe coving. The relationship between walls and ceilings is not relevant to this term, as that would pertain more to architectural details rather than safety or hygiene practices. Similarly, while food preparation areas are indeed important in food safety, they don't specifically relate to coving. Lastly, an equipment cleaning method refers to procedures for maintaining cleanliness, which is distinct from the structural feature that coving represents.