Final answer:
The second scenario involves players being allowed to communicate and give signals about their strategies, helping them overcome the prisoner's dilemma through strategic decision-making.
Step-by-step explanation:
The second scenario Professor Dave mentions is one where the players are allowed to talk with each other and give signals about their strategies. This allows them to overcome the prisoner's dilemma through strategic decision-making. By communicating and coordinating their actions, the players can achieve a better outcome than if they had acted independently.