Consider the following statements on transportation problem:
1. In Vogel’s approximation method, priority allotment is made in the cell with lowest cost in the column or row with least penalty.
2. The North-West corner method ensures faster optimal solution.
3. If the total demand is higher than the supply, transportation problem cannot by solved
4. A feasible solution may not be an optimal solution.
Which of these statements are correct?
(a) 1 and 4 (b) 1 and 3
(c) 2 and 3 (d) 2 and 4