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When solving the problem of linear programming and the objective function reduction and purification you have the following table, the correct answer

Question 25 (Maximization) Not yet answered j Basics X1 9 X2 6 S1 0 S2 0 R.H.S. Marked out of 2.00 9 X2 1 -1 2 0 100 0 S2 O -2 -1 P Flag question 1 50 9 -9 18 0 Zi 900 g-zi 0 15 -18 0 . Infeasible solution Ob. No correct answer O c. More than one optimal solution O d. Optimal Question 25 (Maximization) Not yet answered S1 Basics X1 9 X2 6 R.H.S. Marked out of 2.00 Noo NO 9 X2 1 -1 100 0 S2 0 P Flag question -2 -1 1 50 9 -9 18 O Zi 900 0 ci-zi 0 15 -18 0 . Infeasible solution O b. No correct answer . More than one optimal solution O d. Optimal