Your question is Tune Hyperparameters for Model Selection. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are choosing hyperparameters for a machine learning model and need a principled way to compare candidates before final evaluation.
How do you tune hyperparameters for a machine learning model?