Instructions: Use the following scenario and data for questions 1 to 10. Groff Kitchen LLC makes two types of barbeque grills. The availability of three scarce resources limits the production of the grills. The profit contribution, resource usage per unit of each grill, and availability of the resources are given in the following table: The decision variables used in the linear programming model are: x1 Number of units of grill 1 to produce x2 - Number of units of grill 2 to produce The linear programming model and the graphic solution are given in the following Max 15x1+12x22x1+3x21804x1+2x22007x1+6x2420x1,x20 s.t Keeping c2 constant at c2=12, the interval for c1 in which the current optimal solution remains optimal is 14c12414c12424c11424c114 none of the above