The root regions are arranged proximal to distal part in the following manner. 

• A

  Zone of cell elongation‒ Zone of cell maturation ‒ Zone of cell divisions 

• B

   Zone of cell divisions ‒ Zone of cell elongation ‒ Zone of cell maturation 

• C

  Zone of cell maturation‒ Zone of elongation ‒ Zone of cell divisions 

• D

  Zone of cell maturation ‒ Zone of cell divisions ‒ Zone of cell elongation