What does rollback refer to in rabbit fur?

Rollback in the context of rabbit fur refers to a gradual return of the fur to its normal position after being stroked or ruffled. When you run your hand against the grain of the fur and then release it, rollback describes how the fur slowly returns upright. This characteristic is important for judging the quality and texture of the fur in rabbits, as it indicates a healthy coat and proper grooming.

The other options do not accurately depict the nature of rollback. For example, a fast return to its original position suggests an instantaneous reaction, which does not capture the gradual aspect of rollback. The idea of complete flatness of fur does not refer to the term rollback but rather describes a different condition of the fur, possibly indicating poor quality or care. A specific color pattern is unrelated to the texture or behavior of the fur when stroked, thus not applicable in the context of defining rollback.