Answer: A. Executing agency
In industrial robots, the robot body is the actuator that completes various operations.
It consists of joints, arms, wrists, hands, and other mechanisms, and can be a single unit or a lengthy structure consisting of multiple joints and arms, depending on the application needs.
Through the connection with the drive, the robot body can realize various forms of movement, such as rotation, translation, scaling, etc., so as to complete various operations, such as grasping, assembly, welding, etc.
Therefore, the answer to this question is A.