A kitchen cabinet shop with four cabinet makers receives a contract to work on a project that requires four different tasks: milling, sanding, building, and staining. The project needs to be completed as soon as possible. The owner wants to assign each of the four tasks to an employee with an overall goal of minimizing the projects completion time and has recorded the amount of time each employee has taken to complete the four tasks from previous projects. The accompanying table shows the employees average completion time (in hours) for each task. Define the design variables.

Multiple Choice xij representing task i being assigned to employee j wij representing average completion time for employee i, task j wij representing average completion time for task i, employee j xij representing employee i being assigned to task j