$$X_3$$ and $$Y_2$$, when reacted with $$A$$ and $$B$$ in aqueous solution, give a brown colour. These are separated by a semipermeable membrane as shown in the figure. Assuming that electrolytes are completely ionized in solution, then due to osmosis there is

A

Brown colour formation in side X

B

Brown colour formation in side Y

C

Brown colour formation in both sides X and Y

D

No brown colour formation in sides X or Y