Welcome to your interview.
The question is on your right: Mitigating System Design Failure Points. 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 the potential failure points in this system design, and how would you mitigate them?