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Access to infrastructure and physical computing resources, such as servers and storage, is accurately described by Infrastructure-as-a-Service (IaaS). IaaS provides users with virtualized computing resources over the internet, allowing them to manage and control their infrastructure without needing to invest in physical hardware. Clients can provision and manage virtual machines, storage options, and networks on-demand, which provides flexibility and scalability for various computing needs.

In the context of cloud service models, IaaS stands out by focusing specifically on the foundational layer of cloud computing, allowing for direct management of computing resources while abstracting away the underlying physical infrastructure. This flexibility can be crucial for businesses that require customizable solutions, as they can scale resources up or down as necessary without the constraints associated with maintaining physical servers.

The other service models do not center on the infrastructure directly. Software-as-a-Service (SaaS) focuses on delivering software applications over the internet, while Platform-as-a-Service (PaaS) provides a platform for developers to build and deploy applications without managing the underlying infrastructure. Similarly, Function-as-a-Service (FaaS) pertains to executing code in response to events without dealing with server management, placing the emphasis on individual functions rather than comprehensive infrastructure access.