Which part of the auxiliary system sets motion-triggered actions for each camera individually?

The correct answer is motion detection, as it refers to the technology and processes that enable cameras to recognize movement in their field of view. This system is essential for setting up motion-triggered actions tailored to each camera. When motion is detected, it can prompt responses such as recording footage or sending alerts, depending on the configuration for each individual camera.

Motion detection typically involves algorithms and sensors that analyze changes in the scene captured by the camera, allowing you to customize settings based on specific needs or behaviors. This means that it can be uniquely adjusted for each camera setup, providing flexibility in monitoring distinct areas or situations.

The other options, such as live previewing, recording, and camera scheduling, serve different functions. Live previewing allows users to view real-time footage, while recording functions are primarily related to capturing and storing video data regardless of whether motion is detected. Camera scheduling pertains to setting times for cameras to operate or record, irrespective of whether motion is present. Thus, those functions do not individually trigger camera actions based on detected movement, distinguishing them from the role of motion detection.