Your question is Difference Between IaaS, PaaS, and SaaS. 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).
What is the difference between IaaS, SaaS, and PaaS?
Asked in the technical/system-design portion of one of the three 45-minute interview stages. Raised as one of the system design technical questions during the loop.