QUESTION 6 should be In the simplex method, if there is a die fequality between a decision variable and a slack (or surplus) variable in C-Z row for a maximization LP selected. O decision variable O Any variable with highest posative value O surplus variable Stack variable QUESTION In the 2-phne simplex method. In the first phase (as weiterate), we try to Pickup the least negative sum of the artificial variables Pickup the least negative sum of the basic variables pickup the most negative sum of the artificial variables Pickup the most negative sum of the basic variables