A finance company runs virtual machines in Azure but manages the operating system and networking itself. Which cloud service model is this?

This scenario describes Infrastructure as a Service (IaaS). With IaaS, Azure provides the underlying infrastructure, such as virtual machines, storage, and networking, but the customer is responsible for managing the operating system, applications, and data. The finance company manages the OS and networking, aligning perfectly with the IaaS model. SaaS (Software as a Service) would mean Azure manages everything, including the application itself, with the customer only using the software. PaaS (Platform as a Service) would involve Azure managing the operating system and underlying infrastructure, with the customer deploying their applications onto that platform. Public Cloud is a deployment model, not a service model, and refers to cloud services offered over the public internet by a third-party provider like Azure.