(a) Find all the equilibria of the following two-player game.
(b) Suppose the players play the game twice; after the first time they have played the game, they know the actions chosen by both of them, and hence each player may condition his action in the second stage on the actions that were chosen in the first stage. Describe this two-stage game as an extensive-form game.
(c) What are all the subgames of the two-stage game?
(d) Find all the subgame perfect equilibria of the two-stage game.