How Do Mineral Ions Get into the Xylem Cells of a Plant

How do mineral ions get into the xylem cells of a plant root by way of the intracellular route?

A) They percolate between root cells to the xylem and then enter a xylem vessel.
B) They are actively taken in to the xylem of root hairs.
C) They are taken up by root hair cells and transferred from cell to cell via plasmodesmata.
D) They move in solution through cell walls of the endodermis.