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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

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