Which API is used to manage device configurations in Cisco DNA Center?

The correct answer is that the Device Management API is utilized to manage device configurations in Cisco DNA Center. This API provides a comprehensive interface for performing operations such as retrieving the current configurations of devices, making changes to configurations, and applying updates systematically across multiple devices.

The Device Management API is specifically designed to handle the complexities associated with managing network devices' configurations and offers functionality necessary for automation and orchestration within the Cisco DNA environment. By leveraging this API, network administrators can streamline their operations, ensuring that configurations are consistent, compliant, and easily manageable at scale.

In contrast, while the other options such as the Infrastructure API, Network Configuration API, and Site Configuration API may deal with various aspects of managing network infrastructure, they do not specifically focus on the detailed device configurations as required in this context. Each of these APIs serves a different use case or functionality within the Cisco DNA Center ecosystem.