Final answer:
The simplest form of client/server configuration where the client handles UI and the server performs most of the processing is known as host-based processing. Option A is correct.
Step-by-step explanation:
The most basic class of client/server configuration described by the question, where the client provides the graphical user interface and the server does virtually all the processing, is host-based processing. In host-based processing setups, thin clients are used.
The thin client is mainly responsible for displaying data to the user, while the server has the bulk of the computational power and handles tasks such as data storage, processing, and management. This contrasts with other architectures like client-based processing, where the client handles a significant portion of the processing load, and cooperative processing (or distributed processing), where tasks are split between the server and client.
The most basic class of client/server configuration is host-based processing, in which the client is principally responsible for providing a graphical user interface, while virtually all of the processing is done on the server. This configuration is commonly used in web applications, where the client's browser acts as the interface, while the server handles the business logic and data processing.