The following five questions are all based on the following Sensitivity Report: Final Reduced Objective Allowable Allowable Cell Name Value Cost Coefficient Increase Decrease $B$4 Units of X1 1E+30 2.8 $C$4 Units of X2 -4.67 2 4.67 1E+30 Final Shadow Constraint Allowable Allowable Cell Name Value Price R.H. Side Increase Decrease $D$9 Carpentry hours LHS 10 20 1E+30 10 $D$10 Painting hours LHS 15 1.33 15 15 15 What range of values can the objective function coefficient for X1 assume without changing the optimal solution? O Increase by any amount, decrease by 10 O Increase by any amount, decrease by 2.8 O Increase by 15, decrease by 15 O Increase by 4.67, decrease by any amount O Cannot be determined