In which cloud model does the customer take responsibility for selecting and configuring operating systems, while the provider manages the underlying infrastructure?

The correct answer is that in a Platform as a Service (PaaS) cloud model, the customer is responsible for selecting and configuring the operating systems, while the provider manages the underlying infrastructure. In a PaaS environment, the service provider supplies a platform that includes hardware and software tools over the internet, typically used for application development. This allows customers to focus on developing their applications without needing to manage the underlying hardware or the operating system, which is handled by the provider.

PaaS is particularly beneficial for developers because it provides a framework that can be tailored to specific needs, enabling quicker development cycles. Users can select and configure their preferred operating systems and specific development languages, which facilitates easier integration and accommodates various application needs.

In contrast, other cloud models differ significantly in responsibility allocation. For instance, Software as a Service (SaaS) provides fully functional applications managed entirely by the service provider, requiring minimal configuration by the customer. In Infrastructure as a Service (IaaS), the customer has more control over the infrastructure level, including the operating systems, but that also means they take on more responsibility for managing those systems. On-site solutions entail total control and management by the organization itself, removing the benefits of cloud scalability and flexibility.