Which service model allows users to rent IT infrastructure such as servers and storage?

Infrastructure as a Service (IaaS) is the correct choice because it is a cloud computing service model that provides virtualized computing resources over the internet. In this model, users can rent IT infrastructure, including servers, storage, networking, and the operating systems, on a pay-as-you-go basis. This allows organizations to avoid the expenses and complexities associated with purchasing and maintaining physical servers and other infrastructure components. IaaS offers scalability and flexibility, enabling companies to quickly adjust their resources according to demand without the need for large upfront capital expenditures.

By contrast, Software as a Service (SaaS) delivers software applications over the internet on a subscription basis, focusing more on providing software solutions rather than infrastructure. Platform as a Service (PaaS) provides a platform allowing developers to build, deploy, and manage applications without the intricacies of managing the underlying infrastructure. Data as a Service (DaaS) is focused on delivering data to users on demand, rather than providing access to the fundamental IT resources required to run applications and services.