Which pairing of Azure service and cloud service type is correct?
A.Azure Virtual Machines — SaaS
VMs give you full OS control — that's the classic IaaS offering.
B.Azure App Service — IaaS
App Service abstracts the OS — PaaS, not IaaS.
C.Microsoft 365 — PaaS
Microsoft 365 is finished end-user software — SaaS.
D.Azure Functions — PaaS
Functions is a serverless PaaS: you supply code, Azure runs infrastructure and scales automatically.
Why this answer
Azure VMs = IaaS (you manage the OS). App Service and Functions = PaaS (provider manages OS and runtime; Functions adds serverless event-driven execution). Microsoft 365 = SaaS (finished software). These service-model mappings are among the most repeated AZ-900 questions.
Correct answer: D · Last reviewed 2026-02-13
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