Consider the following pame, Where Barb chooses a column and chooses to play Left, Middle Column Right, and Isaac chooses a row, either Up, Middle Row, or Bottom and payoffs are as follows; Barb Left Middle Col Right 2,2 Y,3 Top 4,1 Isaac Middle Row X,O 1,4 0,3 Z,4 2,3 Bottom 5,5 The payoffs are written (Isaac, Barb) 1 1. Suppose that Isaac playing Top and Barb playing right is a Nash Equilibrium then which of the following must be true: a. X2 c. Z