Which technique is primarily used to enhance user experience by allowing more users than the infrastructure supports?

The technique that enhances user experience by allowing more users than the infrastructure can directly support is oversubscription. This approach involves allocating more resources or user connections than are physically available, based on the understanding that not all users will be using the resources simultaneously. It capitalizes on statistical averages of user behavior, which can lead to more efficient resource utilization.

In environments like cloud computing or network management, oversubscription can significantly improve user experience by reducing costs and maximizing the number of concurrent users who can access services. For instance, in a cloud context, a provider might offer virtual server instances to many clients, knowing that not all will be drawing heavily on CPU or memory resources at the same time.

Other options, while relevant to infrastructure and user management, do not specifically address the concept of allowing more users than the infrastructure supports. Load balancing distributes incoming user loads across multiple servers but does not exceed total capacity. Vertical scaling increases the power of individual systems but can still hit hardware limits. Horizontal scaling adds more machines to share the load but operates within the physical limits of infrastructure capacity. Thus, oversubscription uniquely focuses on the concept of exceeding resource capacity by anticipating usage patterns.