Find the optimum solution to the given transportation problem. The values given in the interior boxes are the cost of transportation between the corresponding source (S) and destination (D) and the values given in the right margin and lower margin are the supply capacity and demands of the sources and destinations respectively. D₁ D2 D3 D4 S₁ 3 7 6 4 Supply 5 S2 2 4 3 2 2 S3 4 3 8 5 3 Demand 3 3 2 2