Speedy delivery provides two-day delivery service of large parcels across the US. Each morning, the dispatcher organizes trucks to ensure all deliveries are met. The company has three drivers available today that need to be allocated into three of the possible 'attractive' routes you pre-determined. The table with the routes in in the Excel file. The '1's mark the delivery locations each route visits. Find which three routes should be allocated to the three drivers so that each delivery location is visited at least once and that minimizes the total travel time. Which routes should be used? (list your answer in numerical order separate by commas with no spaces, e.g., 1,2,3 or 3,4,8)