What is one feature of 'barred' markings in rabbits?

Barred markings in rabbits are characterized by alternating colors or patterns that create a striped or banded effect on the fur. This is commonly represented by elongated spots or stripes that contrast with the base color of the coat. These markings can occur in various colors and are visually distinct, helping to define the breed's appearance.

The other options do not align with the definition of barred markings. A completely white body lacks the contrasting features required to qualify as barred. Curled fur at the tips of the ears does not relate to the recognizable pattern of bars, and a uniform color on the belly also does not represent the striped effect associated with barred markings. Therefore, the choice highlighting elongated spots accurately captures the essence of what barred markings are in rabbits.