In monocot roots,which type of vascular bundles are found?

What part of the plant would show the following:
$(a)$ Radial vascular bundle
$(b)$ Polyarch xylem
$(c)$ Well developed pith

On the basis of the number of xylem bundles,the maize root is termed as:

$(i)$ Unicellular hair
$(ii)$ Endodermis with passage cells
$(iii)$ Pith$-$small$/$inconspicuous
$(iv)$ Radial vascular bundle
$(v)$ Xylem exarch
$(vi)$ $2-4$ xylem and phloem
The above description refers to which of the following?

Identify $A, B$ and $C$ indicated in the diagram of the root apex given below.

Water does not pass through which of the following structures due to the presence of suberin?