3 The utility possibilities frontier for the two individuals A and B can be represented by 60 ( / 2) U U B A = for UA 0,80 and 100 U U B A = for UA 80,100 where UA and UB stand for the utilities of A and B respectively. What are the optimal levels of UA and UB according to the Rawlsian criterion? (a) UA=40 and UB=50. (b) UA=50 and UB=40. (c) UA=40 and UB=40. (d) UA=50 and UB=50