Which cloud service model best allows users to deploy applications without worrying about underlying infrastructure?

The correct choice is identified as PaaS, which stands for Platform as a Service. This model is specifically designed to allow users to focus on developing and deploying applications without having to manage the underlying infrastructure that supports those applications. This means that users can utilize pre-configured environments, frameworks, and tools provided by the PaaS provider to streamline application development processes.

By using PaaS, developers can concentrate on coding and application functionality while the cloud provider takes care of hardware, storage, networking, operating systems, and middleware. This separation of concerns not only accelerates the development cycle but also fosters innovation since developers can leverage the platform's features without delving into the complexities of the infrastructure underneath.

In contrast, IaaS (Infrastructure as a Service) requires users to manage more of the underlying infrastructure, including virtual machines and storage configurations. SaaS (Software as a Service) provides fully built applications over the internet, but users do not have the ability to deploy their own applications, as they are using software created by someone else. XaaS (Anything as a Service) is a more generalized term that encompasses all service models, including IaaS, PaaS, and SaaS, and does not specify the ease of application deployment