What happen in plants during vasculariation
A. Differenation of procambium, formation of primary phloem followed by formation of primary xylem
B. Differenation of procambium followed by the formation of primary phloem and xylem siultaneusly
C. Formation of procambium, primary phloem and xylem simultaneously
D. Differentiation of procambium followed by the formation of secondary xylem
