Which of the following best represents the underlying service models in a computing stack?

The correct answer reflects the fundamental service models commonly used in cloud computing environments. The terms Infrastructure, Platform, and Applications refer directly to the layers of offerings available in the cloud service model framework.

Infrastructure-as-a-Service (IaaS) provides the basic computing resources such as virtual machines and storage, allowing customers to manage their operating systems and applications. Platform-as-a-Service (PaaS) offers a higher-level environment that includes the infrastructure but also provides development tools, enabling users to build and deploy applications without needing to develop the underlying infrastructure. Applications represent software services that are delivered and managed over the internet, allowing for rapid deployment and scaling.

Each of these service models serves different needs: IaaS is for those wanting control over their resources, PaaS is for developers who want to focus on application development without managing hardware and software layers, and Application services are for end-users to access business applications.

The other options, while relevant to cloud computing, do not encapsulate the service models in the same direct manner. For instance, the concepts of public, private, and hybrid describe deployment models rather than service types. Similarly, terms like Broad Network Access, Resource Pooling, and Measured Service articulate characteristics of cloud services but not the layers