Which one of the following option shows the correct labelling of the parts marked as A, B, C and D in the given figure of a typical dicot root?

A. A Primary phloem, B Vascular cambium, C Secondary phloem, D Primary xylem

B. A Secondary phloem, B Vascular cambium, C Primary phloem, D Primary xylem

C. A Primary phloem, B Primary xylem, C Secondary phloem, D Vascular cambium

D. A Secondary phloem, B Primary xylem, C Primary phloem, D Vascular cambium