Which computing model offers shared resources over the internet?

Cloud computing is the correct choice as it refers to a model that allows for on-demand access to a shared pool of configurable computing resources over the internet. This includes networks, servers, storage, applications, and services that can be rapidly provisioned and released with minimal management effort.

In cloud computing, resources are provided as a service and can be accessed remotely, enabling flexibility, scalability, and often a pay-as-you-go billing model. Users can access data and applications from various devices without needing to manage the underlying infrastructure.

The other options do not provide the same capabilities. An intranet is a private network accessible only to an organization's staff and does not qualify as a model offering shared resources over the internet to a broader audience. Mainframe systems refer to powerful computers used primarily by large organizations for bulk data processing and do not inherently provide shared resources over the internet. Stand-alone software is designed to run independently on individual devices and lacks the resource-sharing collaboration that cloud computing provides.