Select the best example of cloud computing.

The best example of cloud computing is when a company uses virtualization to provide on-demand web servers and virtual environments accessible over the internet. This scenario exemplifies key characteristics of cloud computing, such as scalability, accessibility, and resource pooling.

In this case, virtualization allows multiple virtual servers to run on a single physical server, optimally utilizing resources. By providing web servers and virtual environments on demand, this solution is aligning with the cloud model, which offers resources as a service over the internet rather than requiring users to manage local hardware and software. Users can access these services from anywhere, illustrating one of the primary benefits of cloud computing: the ability to access resources remotely and flexibly.

The other scenarios describe more traditional IT practices. For instance, installing a hypervisor on a local server indicates in-house management of resources, which does not represent the outsourced flexibility or the internet integration typical of cloud computing. Similarly, keeping a database backup on a file server and using tape backups for secure data storage are more aligned with on-premises data management and backup practices rather than the dynamic, scalable solutions offered by the cloud.