Consider an LP model of a manufacturing process concemed with the production of four variants of the same product, A,B,C, and D, each of which will yield a certain profit per unit sold, and each requires a certain time for assembly, packing and polishing. Given the current state of the labor force the company estimates time limits available for each of the availability operation. The objective is to determine how many of each variant to make to achieve the greatest possible profit while satisfying all constraints. Figure A. LP Formulation Maximize 3A+2.8B+3C+4.5D Subject to Assembly 2A+4B+4C+6D100,000 minutes Polish 3A+2B+4C+4D50,000 minutes Pack 2A+4B+2C+5D60,000 minutes A,B,C,D0 Table A. Sensitivity Report Constraints Reference: LP Model - Production of four product variants Consider Figure A and associated Table A. Which constraints are binding? A. 1 B. 2 C. 2 and 3 D. 1 and 3 E. none of the above