Which of the following accurately describes a Blue Roan horse?

A Blue Roan horse is characterized by a specific coloring that consists of a mixture of dark hairs, typically black, and white hairs, resulting in a blue-tinged coat. The distinctive feature is that the horse usually has a darker head compared to the lighter mixed body. This contrast is what defines the Blue Roan, as the darker hues predominately affect the head, while the body shows a blend of darker and lighter hairs.

In contrast, other choices describe different color patterns or coat characteristics that do not align with the definition of a Blue Roan. For instance, a tri-colored horse with white patches is not representative of the Blue Roan's uniform blend. Similarly, a uniform mixture of white and red hairs would describe a different color entirely, likely a red or chestnut coloration. Lastly, a black mane and tail with a gray body suggests a specific gray coloration which is also distinct from the characteristics of a Blue Roan. Understanding these subtle differences in horse coat colors helps to clearly identify breeds and individual horses.