Your question is Choose Cloud Scaling Strategy. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are reviewing capacity options for a cloud-hosted production service that is approaching its performance limits. Before committing to an infrastructure plan, you need to explain the execution implications of scaling the system in different ways.
Explain the difference between horizontal and vertical scaling in a cloud environment, and how you would decide between them for a live service.