What is the key role of a client-server network in business?

The key role of a client-server network in business is centered around enabling personal computer users to securely access shared data. In a client-server architecture, the client (usually a personal computer or workstation) requests resources or services from the server, which is a more powerful system that provides the data or resources needed. This setup is essential for businesses as it ensures that users can access important and often centralized data efficiently and securely.

Security is a fundamental component of this model, as data is often sensitive and requires controlled access. The client-server model ensures that only authorized users can access specific data stored on the server, which greatly enhances the protection of critical business information. This secure access model is pivotal in environments where multiple users need to collaborate on data, hence making it a vital role within business operations.

The other options, while they may incorporate aspects of network functionality, do not encapsulate the broad and fundamental role that client-server networks play in facilitating secure access to shared data across various business functions.