It is about an infinitely repeated game.

L C R U 5, 6 2, 2 10, 3 M 2, 2 6, 5 0, 3 D 3, 0 3,0 3,3 (a) What are the Nash equilibria of the stage game? (b) Find a subgame perfect Nash equilibrium of the infinitely repeated game where the players use a grim trigger strategy, and where the equilibrium outcome is ((U, L), (U, L), (U, L), ...). Be sure to specify the minimum o that supports such an SPNE