Which service model provides access to infrastructure and physical computing resources like servers and storage?

Infrastructure as a Service (IaaS) is the correct answer because this service model offers virtualized computing resources over the internet. It provides users with access to fundamental infrastructure components such as servers, storage, and networking. With IaaS, organizations can manage and control the operating systems, applications, and middleware, while the underlying hardware is maintained by the service provider. This model is particularly advantageous for businesses that require scalable resources and wish to avoid the costs associated with purchasing and maintaining physical hardware, as it allows for flexible scaling of resources based on demand.

In contrast, Platform as a Service (PaaS) focuses on providing a platform that allows developers to build, deploy, and manage applications without worrying about the underlying infrastructure. Software as a Service (SaaS) delivers software applications over the internet, which users access via a web browser, eliminating the need for installation or maintenance of the software on local machines. Function as a Service (FaaS) is a serverless computing model that allows users to run code in response to events without managing servers directly. Each of these models serves a different purpose and offers distinct benefits, emphasizing the comprehensive nature of IaaS in providing direct access to physical computing resources.