What model allows for on-demand network access to a shared pool of configurable computing resources?

The correct answer is cloud computing, as this model is specifically designed to provide on-demand network access to a shared pool of configurable computing resources. This infrastructure supports multiple users and allows access to computing power, storage, applications, and services over the internet.

Cloud computing operates on the principle of virtualization, where physical resources are abstracted to create a scalable resource pool that can be dynamically assigned and managed as needed. This adaptability is one of the key features that empower organizations to efficiently use computing resources according to their requirements, without the need for extensive upfront investments in hardware or software.

Distributed computing, while also involving shared resources, typically emphasizes the distribution of processing tasks across multiple computers rather than the flexible, self-service model of resource allocation found in cloud computing. Grid computing uses a similar approach of connecting various systems to perform complex tasks but is generally more focused on high-performance computing applications rather than providing configurable resources for users.

Virtual computing refers to the creation of virtual versions of physical computing resources, but it doesn't necessarily imply the same level of shared access and flexibility that cloud computing offers. Overall, cloud computing is the model that best fits the description of providing on-demand access to a wide range of configurable computing resources.