Question 4: [15 Points] Consider the following two-player game (a, b, c, d any real numbers): P2 L R U a, b 0. 0 PI D 0, 0 c, d 1. The game is REPEATED ONCE. Identify all the subgame perfect Nash equi- libria of this game (in pure strategies), depending on the values of a, b, c and d. 2. Assume now that a, b, c and d are all strictly positive numbers. If the game was INFINITELY repeated, and players had a discount factor of 0