Welcome to your interview.
The question is on your right: Applying SOLID Principles. 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 principles of SOLID design, and can you provide an example of how you have applied them?