Welcome to your interview.
The question is on your right: Key Types in Database Design. 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.
How do primary keys, foreign keys, and unique keys differ in terms of database design and performance optimization?