While researching a wall-following robot, a student has taken the following notes: - The robot has a sensor that measures its distance from a wall. - A processor compares the measured distance with a target distance. - The processor adjusts the wheel speeds to keep the robot near the target distance. - The robot's body is shaped like a cube. - Students decorated the body with star stickers. The student wants to explain the robot's feedback system. Which choice most effectively accomplishes the goal while using only relevant information from the notes?