Charlie, Drew, and Emerson have been selected by their boss to work together in a project. Each of them needs to determine whether to work on Sunday or not. If the three individuals work on Sunday, each of them receives a payoff of 11. If only two work on Sunday and one does not work, the people that work on Sunday receive a payoff of 9 while the person that does not work receives a payoff of 12. If only one person works on Sunday and the other two do not work, the one that works receives a payoff of 7 and those that do not work receive a payoff of 10. If no one work on Sunday, they all receive a payoff of 8.

a. What is the Pure Strategy Nash Equilibrium of this game?