A.
player 1’s strategies are: a, b; player 2’s strategies are x, y
B.
player 1’s strategies are: aa, ab, ba, bb; player 2’s strategies are x, y
C.
Player 1’s strategies are: a, b; player 2’s strategies are xx, xy, yx, yy
D.
player 1’s strategies are: aa, ab, ba, bb; player 2’s strategies are xx, xy, yx, yy