A chemical manufacturer produces two products, chemical X and chemical Y. Each product is manufactured by a two-step process that involves blending and mixing in machine Aand packaging on machine B. Chemical X provides a $60/unit contribution to prot, while Chemical Y provides a $55 contribution to prot. The processing times for the two products on the mixing machine (A) and the packaging machine (B) are as follows: Product Machine A Machine B (hours) (hours) Chemical X 3 3 Chemical Y 5 2 For the upcoming two-week period, machineA has available 90 hours and machine B has available 60 hours of processing time. Forecasts of the markets indicate that the manufacturer can expect to sell a maximum of 16 units of chemical X and 18 units of chemical Y. The objective function of this problem is O a. maximize 60x +55y O b. maximize 90x + 60y O c. minimize 65x +50y Q d. maximize 55x +60y