Consider the following assembly line problem: time_to_reach[2][3] = {{17, 2, 7}, {19, 4, 9}} time_spent[2][4] = {{6, 5, 15, 7}, {5, 10, 11, 4}} entry_time[2] = {8, 10} exit_time[2] = {10, 7} num_of_stations = 4 For the optimal solution, which should be the starting assembly line?