QUESTION $16$ A reasonable constraint to model the total shipment of fertilizers to farmer $2$ to satisfy demand is OX$12+$X$22$X$3226800$y$1$ X$12+$X$22$X$3226800$ O $20$x $1215$x$22+31$x$326800$y$1$ O $20$x $1215$x$2231$x$3226800$ None of the above. QUESTION $17$ Which of the following is not a constraint modeling the requirement that the total shipment of fertilizers from potential warehouse $2$ must be within the capacity of the warehouse $35500$y$2$ OX$21+$X$22$X$23+$ X$24$ OX$21+$ X$22$X$23$X$24-35500$y$20$ O$22$x$2115$x$2224$x$23+16$x$24-35500$y$20$ O all of the above. None of the above. QUESTION $18$ The appropriate integer programming model should be None of the above. QUESTION $19$ The constraints Vi $0$ or $1,$ for all i$1,2,3,$ in the model means Othe values of Xii, for $=1,2,3$ and j $=1,2,3,4,$ must be integers Othe values of Vi$,$ for i$=1,2,3,$ must be positive. the value of each Vi$,$ for i $=1,2,3,$ in the final solution must be $0$ or $1.$ it will be sufficient if each Vi$,$ for i $1,2,3,$ is nonnegative. none of the above. QUESTION $20$ In the final optimal solution, X$24=5400$ is obtained. This means y$21$ is in the final solution. $5400$ tons of fertilizers will be shipped from potential warehouse $2$ to farmer $4$ Othe shipping cost along the road from potential warehouse $2$ to farmer $4$ is $$86,400.$ all of the above. ONone of the above.