Which kind of data refers specifically to information that is actively being transferred between systems or networks?

The correct choice refers to data actively being transferred between systems or networks. This concept is crucial for understanding how information travels and the associated security risks during that transfer process.

Data in transit encompasses any data being sent or received over a network, either through file transfers, emails, or web communications. Ensuring the security of data in transit is vital because this phase is particularly vulnerable to interception or eavesdropping by unauthorized parties. Security measures such as encryption protocols (like SSL/TLS) are commonly implemented to protect this type of data as it moves between endpoints.

In contrast, data at rest refers to information stored on a device or in a database, data in use concerns information actively being processed by applications, and data removal pertains to the practices surrounding the secure deletion of data to prevent unauthorized recovery. Understanding these distinctions is important for effectively securing all forms of data throughout its lifecycle.