Following are certain statements regarding root growth and differentiation in plants:

A. Root hair, endodermis, xylem and phloem reach maturation in elongation zone of a developing root.

B. The root epidermal cells that are incapable of forming root hairs are called atrichoblasts.

C. Quiescent center is present just above root cap.

D. In Arabidopsis, an auxin transporter (ABCB4) plays a role in root hair emergence by maintaining intracellular auxin concentration.

Which one of the following combination of statements is correct?