Question: If a side constraint for a network flow model cannot be avoided, and non-integer solutions result, how can the solution be expressed as an integer

If a side constraint for a network flow model cannot be avoided, and non-integer solutions result, how can the solution be expressed as an integer solution?

a. Round off all the non-integer arc flow decision variables.

b. Increase the supply until the solutions are all integral using a dummy supply node.

c. Apply integer programming techniques.

d. Increase the demand until the solutions are all integral using a dummy demand node.

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