Can you please describe the answer and give an example. Thanks

Question 6 O out of 10 points The total population of cigarette smokers in many markets is stagnant or decreasing over time. Under such conditions, the goal of tobacco companies is to entice existing smokers to switch brands. These tobacco marketers are playing which type of game? Selected Answer: Nash equilibrium Answers: Non-zero-sum Zero-sum Nash equilibrium Positive-sum