Consider the flu shot game: It's flu season, and two roomates must decide on whether or not to get a flu shot, which costs K>0 dollars. Let S>0 represent the benefit of not getting sick, and -S represent the cost of getting sick. Now, if neither roomate pays for the shot, they both get sick. However, if either of the roomates buy the shot, neither of them gets sick. Suppose that S>K (so that the benefit of not getting sick is greater than the cost of the shot), and write the game in payoff matrix/table form. Which image