In which of the following service models does the cloud service provider take responsibility for the installation, configuration, and operation of the application infrastructure?

The Platform as a Service (PaaS) model is characterized by the cloud service provider managing the underlying infrastructure, including servers, storage, and networking, as well as the operating system and application runtime. This allows developers to focus on building and deploying applications without needing to worry about the installation, configuration, and operation of the underlying infrastructure.

In PaaS, the provider typically offers tools and services that aid in application development, such as databases, middleware, and development frameworks, enabling a streamlined development process. This model is particularly beneficial for teams looking to build applications quickly and efficiently while leveraging the provider’s infrastructure management capabilities.

The other service models do not provide the same level of management for application infrastructures by the cloud provider. Infrastructure as a Service (IaaS) involves the client managing the operating system and applications, while Software as a Service (SaaS) delivers applications over the internet without the need for local installation or management, but it does not give the user control over the underlying infrastructure. Function as a Service (FaaS) enables users to execute code in response to events but does not encapsulate the broader application management responsibilities like PaaS does.