Welcome to your interview.
The question is on your right: Data Structures and Joins. 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.
Describe when you would use linked lists, arrays, and maps, and explain the difference between inner join and outer join.