In your role at a gaming company managing a popular online multiplayer game, where teams of six players compete in five-minute battles daily, with new players joining regularly, you're tasked with enhancing player experience by developing a model to assign these new players to teams in real-time, considering their skill level. The model aims to balance teams to ensure fair play and maximize engagement. Given the constraints of real-time processing, scalability to accommodate fluctuating player numbers, and the need for cost-effective cloud resource utilization, which of the following business metrics would best measure the performance of this model? Choose two correct options.