3. The Queens Furniture Company produces beds and desks. Each bed requires 12 hours of carpentry and 8 hours of varnishing. Each desk requires 8 hours of carpentry and 16 hours of varnishing. There are 72 hours of carpentry time and 80 hours of varnishing time available. Beds earn $60 of profit per unit and desks earn $80 of profit per unit. What is the objective function? a. P= 12x + 8y b. P= 8x + 16y c. P=60x + 80y d. P= 12x + 16y a. c. 4. Refer to the data in question 3. Which is the complete set of constraints? 8x + 12y 0 x, y> 0 b. 12x + 8y 0 x, y