Please help me understand.

Player 2 Left Middle Right Up P1: $45 P1: $43 P1: SO Player 1 P2: $45 P2: $43 P2: $56 Middle PI: $15 PI: $57 P1: SO P2: $65 P2: $2 P2: $68 Down P1: $62 P1: $83 PI: $1 P2: SO P2: SO P2: $1 Note: You do not need to include mixed strategy Nash equilibrium in your answer A. What are the Nash equilibrium to this game (if there are any)? B. Are any of the Nash equilibrium efficient? If yes, which one(s)? If any are inefficient, explain why