The correct option is Infrastructure as a Service IaaS.

With Infrastructure as a Service IaaS administrators obtain virtual machines attachable block storage and virtual networking primitives that they can configure directly. They manage the guest operating system middleware and applications while the cloud provider remains responsible for the physical hosts and hypervisor. This level therefore gives customers the greatest direct control over compute storage and network resources.

Platform as a Service PaaS is incorrect because the provider manages the operating system runtime and developer services so administrators do not control individual virtual machines or low level storage and network settings.

Function as a Service FaaS is incorrect because it is a serverless model that runs individual functions and abstracts away servers. There is no exposed VM level access or direct control of storage volumes and networking constructs.

Software as a Service SaaS is incorrect because it delivers fully managed applications and customers normally only configure application features and users. They do not manage the underlying compute storage or network infrastructure.

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