$CuS{O}_4$  on reaction with $K_4\left[Fe{\left(CN\right)}_6\right]$ in aqueous  solution gives chocolate brown  colour. Let these solutions are separated by a semi-permeable membrane, then due to osmosis there is ?

Brown colour formation in the solution of  $CuS{O}_4$

Brown  colour formation in the solution of $K_4\left[Fe{\left(CN\right)}_6\right]$

 Brown colour formation in both the solutions

No Brown colour formation at any side