There are 100 hours of labor, 500 lbs of material and 1000 gallons of water available. If the goal is to maximize the total profit then the objective function is: (the variables A,B,C & D are the number of widgets of each type produced)
a.min 10A +1268C9D
b.min 10A-15B 7CBD
c.max 10A +15B +7C+8D
d.max A B C D