There is some evidence that reptiles called cynodonts may have had whisker-like hairs around their mouths.If true,then what can be properly said of hair?

A)It is a shared derived character of mammals, even if cynodonts continue to be classified as reptiles.
B)It is a shared derived character of the amniote clade, and not of the mammal clade.
C)It is a shared ancestral character of the amniote clade, but only if cynodonts are reclassified as mammals.
D)It is a shared derived character of the mammals, but only if cynodonts are reclassified as mammals.