Which IoT Central REST API operation is used to manage data export definitions?

The correct choice pertains to the operations available within the IoT Central REST API specifically for managing data exports. To effectively manage data export definitions, you first need to retrieve and review the existing definitions that have been set up. This operation is critical as it allows developers and administrators to understand what exports are currently configured, their settings, and enables them to make decisions about any necessary modifications or new configurations.

By listing existing data export definitions, you gain insights into the structure and processes that are already in place, streamlining any further actions such as starting, stopping, or modifying those exports. This function is foundational in effectively managing the overall data export strategy within Azure IoT Central.

Other operations related to data exports, such as starting or stopping processes, are important but come into play after understanding what definitions exist. Therefore, while those actions can be essential for ongoing data management, they do not serve the same foundational purpose as listing out the existing definitions.