Welcome to your interview.
The question is on your right: Normalization and Indexing. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Explain the concepts of database normalization and database indexing, and how they affect read versus write performance.