If a Side Constraint for a Network Flow Model Cannot

Multiple Choice

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) Force all the arc flow decision variables to be integer.
B) Round off all the non-integer arc flow decision variables.
C) Increase the supply until the solutions are all integer using a dummy supply node.
D) Increase the demand until the solutions are all integer using a dummy demand node.