Please help!

1. The normal-form game below represents the stage game of a two-period repeated game. First, determine the pure-strategy stage Nash equilibria in this game. Sec- ond, determine whether the following strategy profile constitutes a SPNE: play (Y,A) in the first period and (Y,C) in the second period, but if either player devi- ates in the first period, play (Z,D) in the second period. Player 2 A B C D X (1, 6) (0, 3) (0, 1) (3, 0) Player 1 Y (5, 6) (3, 2) (2, 7) (2, 2) Z (1, 2) (2,0) (1, 2) (3, 2)