Welcome to your interview.
The question is on your right: Indexing for Read Efficiency. 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.
What are database indexes, how do they improve read efficiency, and what is their impact on write operations?