Your question is Test Pyramid Purpose. 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).
Explain what a test pyramid is and what it is used for.
In your answer, describe the typical test layers, explain why their proportions matter, and connect the model to delivery speed, defect detection, and test maintenance. Include the trade-offs of relying too heavily on unit tests, integration tests, or end-to-end tests.