(3 points) For this LP max 2= -2.01 - 22 +23 s.t. 21 +22 +23 22 +23 21 +23 21, 22, 23 > 0 2 = 1 Rowo of the optimal Primal tableau is: 2 21 S1 e2 rhs 22 0 23 0 a2 M Q M +2 1 4 0 1 1 z (1) Read y = [y yz yz] = CBB-1 from the optimal tableau and knowing that y is dual optimal and that yb== 2, the value of z is 6 (2) The current optimal basis BV is {81, 12, 13]. Does it remain optimal if Ci is changed to 6? (y) n (3) Suppose instead we consider Change 4 where C 2 and a = Does the current dual optimal solution remain feasible? (y) n (4) What is the possibly new optimal value of z after this change is made? 14/5