(c) Assuming that mutual preference independence exists between the attributes, determine the value of aggregate benefits for each site.(d) Plot the aggregate benefits and costs of each site on a graph and hence identify the sites which lie on the efficient frontier.(e) Although a weight of 80 was finally agreed for visual impact, this was only after much debate and some managers still felt that a weight of 65 should have been used while others thought that 95 would have been more appropriate. Perform a sensitivity analysis on the weight assigned to visual impact to examine its effect on the aggregate benefits of the sites and interpret your results.