Answer: C, CAD.
Answer: Robot offline programming is the use of industrial software to establish a connection between robots and CAD.
Robot offline programming is a method of robot programming and simulation on a computer that does not require an actual physical robot.
By using industrial software, virtual robots can be created on a computer and simulated in the movement and operation of robots in real working environments.
In this process, industrial software establishes the link between robots and CAD (computer-aided design).
Through the integration with CAD software, the robot can be programmed on the computer to plan and optimize the robot's motion trajectory, operation mode and task flow.
Therefore, according to the meaning, the answer: C, CAD.