Which of the following describes a software-based client system that monitors data in use and can stop file transfers?

The correct choice is a software-based client system known as Endpoint DLP (Data Loss Prevention) Systems. These systems are designed to monitor and protect sensitive data in use by tracking activities involving data access, modifications, and transfers. By employing various techniques, these systems can recognize when a user attempts to transfer files that meet certain criteria (for example, those containing sensitive information) and can intervene by blocking or stopping those transfers to prevent data leakage.

Endpoint DLP systems operate at the endpoint level, meaning they function directly on the devices used by employees, such as computers or mobile devices. This allows them to enforce policies regarding how data is handled and shared, whether it is through email, cloud services, or removable storage devices.

Understanding the role of Endpoint DLP systems is critical in a security framework, particularly in environments that handle sensitive data, as this technology helps organizations comply with regulations and protects proprietary information from unauthorized access or transmission.