In a Platform as a Service (PaaS) model, the cloud service provider manages the underlying infrastructure, such as servers, storage, and networks. IT employees are generally responsible for managing the applications deployed on the PaaS, which includes developing, testing, and maintaining those applications. Therefore, the component that IT employees are responsible for in a PaaS model is the applications.

In a Platform as a Service (PaaS) model, Microsoft is responsible for providing and managing the underlying infrastructure elements such as storage and operating systems, as well as the platform components like databases. The customers are responsible for their own applications and the data contained within those applications. Therefore, the components that Microsoft is responsible for include storage, databases, and the operating system.

Platform as a Service (PaaS) is the suitable model for hosting a website. PaaS provides an environment with development tools, infrastructure, and operating systems necessary to build, test, deploy, and manage web applications. It abstracts much of the complexity of managing servers and underlying infrastructure, allowing developers to focus on the application itself.

To deploy a Linux virtual machine, Infrastructure as a Service (IaaS) is the appropriate model. IaaS provides the fundamental infrastructure, including virtual machines, storage, and networks, allowing users to run their own operating systems and applications. This gives the most control, flexibility, and management over the virtual machine compared to other models such as SaaS or PaaS, which provide higher-level services and more abstraction from the underlying hardware.