A development team is migrating an on-premises application to the cloud. They want to retain responsibility for installing and patching operating systems, configuring middleware, and controlling the virtual network, but they do not want to purchase, rack, or service any physical servers or storage arrays. Which cloud service model best meets these requirements?
A complete online environment where user interactions require no adjustments beyond the interface
A framework that provides a pre-built runtime environment for developers without control at the operating system level
A setup that runs code segments in short bursts without a virtual machine to manage
A structure granting the ability to manage virtual machines and configure the network, while the hardware is vendor-managed
Infrastructure as a Service fits these needs because it gives customers control of virtual machines, storage, and networking while the provider owns and maintains the underlying hardware and data-center facilities. Serverless Function as a Service merely runs short-lived code with no VM control, Software as a Service hides all configuration behind a finished application, and Platform as a Service supplies a managed runtime that limits access below the application layer.
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