Welcome to your interview.
The question is on your right: Legacy Architecture Modernization Roadmap. 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.
Explain how you approach structuring an analysis for a client's legacy system architecture before proposing a modernization roadmap.