Web hosting is a service that enables customers to deploy a website quickly. This is an example of:

IaaS delivers raw compute, storage, and networking resources where the customer is responsible for installing and managing the OS and application runtime, requiring far more setup than a web hosting scenario.

SaaS delivers a fully managed, ready-to-use software application to end users, whereas web hosting requires the customer to supply and manage their own website application.

Platform as a Service (PaaS) provides customers with a ready-to-use platform - including the runtime, middleware, and OS - on which they deploy their own applications. Web hosting fits this model exactly: the provider manages servers, networking, and the operating environment, while the customer simply deploys their website code quickly without provisioning raw infrastructure. This contrasts with IaaS where the customer manages the OS and runtime themselves.

On-demand software is another term for SaaS and refers to fully managed application delivery, not a platform for customer-deployed websites.

This is incorrect because web hosting is a well-established example of PaaS according to cloud service model definitions.