Which component is not one of the core four components of a UAS?

The drone body can be considered an integral part of a UAS, but it is not typically classified as one of the core four components. The core components of a UAS generally include the payload, control link, control station, and the airframe or platform, which is often not referred to simply as the "drone body." The payload refers to the equipment carried by the UAS for its specific mission, the control link encompasses the communication system that allows operators to control the drone, and the control station is where the operator manages the flight. Thus, while the drone body serves an important purpose as the physical structure that houses these components, it does not fit within the conventional definition of the core components in the context of UAS classification.