Please explain how to solve all the 3 parts in details

Consider the following static Prisoner's Dilemma game. 1. Are there any strictly dominated strategies? Find all the pure strategy Nash Equilibria. For the following parts, suppose this game is played for inniter many times with discount factor for both players ('3 E [0,1). 2. Suppose 6 = 0, nd all the SPNE(s). 3. Let both players adopt the following strategy: start with cooperation; cooperate as long as no one has ever defected before,- otherwise defect. Find the minimum value of 6 such that this is a SPNE