Please solve this game theory question.

05. Given the following Stage Game: Find the value of the discounting factor in order to have cooperation between the two players. Consider the following strategies when the game is repeated infinite period of times. (GT=Grim Trigger strategy, TFT=Tit for Tat Strategy, TFTD=Tit for Tat Strategy starting from D, ALT=Alternate D, C, D, C ...... ) 7 V _l l_ First: (GT,GT) Second: (T FT, ALT) , is it rational for the Player 1 to deviate to play d always. Third: (TFTD, TFT), is it rational for the Player 1 to deviate to Play TFT