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A company needs to run a legacy Windows application that requires specific OS-level driver tuning, but wants the host hardware and physical datacenter managed by the provider. Which cloud service type is the best fit?
APlatform as a Service (PaaS) — e.g. Azure App Service
BHardware as a Service — direct shipment of bare-metal servers
CSoftware as a Service (SaaS) — e.g. Microsoft 365
DInfrastructure as a Service (IaaS) — e.g. Azure Virtual Machines
Answer & Solution
Correct answer: D. Infrastructure as a Service (IaaS) — e.g. Azure Virtual Machines
IaaS gives the customer full OS-level control (drivers, registry, services) while the cloud provider owns hardware and facility. SaaS hands them only a finished app; PaaS abstracts the OS away; "Hardware as a Service" isn't the standard Azure offering for this need.
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