Please show work and explain

2. Two players are engaged in a infinitely repeated game whose stage game is shown below. L R U 4,4 1,2 D 5,1 0,4 a) Find all feasible individually rational payoffs. b) Is payoff (4,4) possible in an SPE (assuming o is sufficiently large)? c) Can you suggest a simple trigger strategy achieving payoff (4,4)? (Hint: find NE of the stage game and recall the weak perfect folk theorem.) How large should o be for this strategy to yield an SPE