logistics question

solve all the question(a,b,c) showing the solution please

a A tourism company needs to transport 14 groups of tourists in group sizes, as shown in the table below. The company uses a homogeneous fleet of buses departing from the same location (Company) with a capacity of 20 for each bus. The company needs to use the minimum possible number of buses to minimize cost. Groups cannot be split; they must stay together. Table 1 Groops stres Size (number of Group persons) A B D E F G H 1 J K L 14 10 9 7 8 11 7 13 6 11 4 7 6 6 M N I J K L M N wat Fest Best Fin bin packing bruristies to atiga cach 13 6 11 4 7. 6 6 A. Use the online Next Fit, First Fit, Best Fit) bin packing heuristics to assign each group to one of the buses. How many empty seats left (the sum of all unused seats resulted from each heuristic)? B. Use the (offline Next fit decreasing, first-fit decreasing, best fit decreasing) bin packing heuristics to assign each group to one of the buses. How many empty seats left (the sum of all unused seats resulted from each heuristic)? C. What is the minimum possible (optimal) required number of buses