Which of the following is true for an optimum solution of a linear programming problem ?
1
Number of non-zero valued slack variables is equal to the number of constraints.
2
Number of non-zero valued variables (including slack) is exactly equal to the number of constraints.
3
Number of non-zero valued slack variables is equal to the number of binding constraints.
4
Number of non-zero valued variables is equal to the number of non-binding constraints.