Please help me solve question number 4 (in relation to #3) Thank you

Consider the following static Prisoner's Dilemma game. C D C 2, 2 -3, 3 D 3, -3 0, 0 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 o such that this is a SPNE. 4. For this part alone, suppose the payoff matrix for the original static game has been changed to: C D C 2, 1 -1, 4 D 3, -3 0, 0 How does your answer to part 3 change? Is the new minimum value of o larger or smaller? Explain