The process of extraction of separated $DNA$ strands from gel is called elution.
$(a)$ In roots,xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
$(b)$ Conjoint closed vascular bundles do not possess cambium.
$(c)$ In open vascular bundles,cambium is present in between xylem and phloem.
$(d)$ The vascular bundles of dicotyledonous stem possess endarch protoxylem.
$(e)$ In monocotyledonous root,usually there are more than six xylem bundles present.
Choose the correct answer from the options given below:

• A
  $(b), (c), (d)$ and $(e)$ Only
• B
  $(a), (b), (c)$ and $(d)$ Only
• C
  $(a), (c), (d)$ and $(e)$ Only
• D
  $(a), (b)$ and $(d)$ Only