Follow the instructions to determine the solution.

Consider a transportation problem with 2 supply nodes, S1 and S2, each having a capacity of 100 units and, 3 demand nodes with demand requirement of 70 at D1, 75 at D2 and 75 at D3. Which of the following statements is true with respect to the corresponding network structure? a. To ensure feasibility we need to add a dummy demand node with a demand requirement of 5 units b. To ensure feasibility we need to increase demand at D1 to 75 units c. To ensure feasibility we need to add a dummy supply node with a capacity of 10 units d. To ensure feasibility we need to add a dummy supply node with a capacity of 20 units e. A solution can be obtained without adding a dummy node