Use the output below for questions 9 - 10. For all questions, use the correct format for a linear program. Staffing Problem - Heinrich's Deli Shift Time # of Workers Required Shift Time Cost per Hour Total Shift Cost per Worker #1: 8AM-12PM 12 4 hours $10 $40 #2: 12PM-4PM 30 4 hours $15 $60 #3: 4PM-8PM 8 4 hours $12 $48 Decision Variables: o X1 = # of workers on shift #1 (8AM-12PM) o X2 = # of workers on shift #2 (12PM-4PM) X3 = # of workers on shift #3 (4PM-8PM) The goal of Heinrich's Deli is to minimize total cost. What is the objective function? Minimize X1 + X2 + X3 Minimize 10X1 + 15X2 + 12x3 Minimize 40X1 + 60X2 + 48X3 None of the above