Which of the following best describes a Thin Client?

A Thin Client is best described as a client that performs most processing on the server. This computing model is designed to minimize the local capabilities of the client device, relying instead on the server for processing power, storage, and applications. This setup allows for a lightweight device that requires less maintenance and hardware power while leveraging the more robust resources of the server.

Thin clients are typically used in environments where many users need access to the same applications and data, such as in businesses or educational institutions. The centralization of processing and storage not only reduces the cost of individual client devices but also simplifies updates, security, and data management, as all of these can be handled on the server side.

In contrast, the other choices describe different types of client systems or usage scenarios. Devices with high storage needs and self-sufficient computers indicate a stronger reliance on local resources, which is opposite to the Thin Client model. A device that can only access online content does not encapsulate the full functionality of a Thin Client, as it implies severe limitations which are not necessarily characteristic of typical Thin Client setups.