Which of the following is true of robots and other labor-saving machines? Group of answer choices They are the primary reason why so many people are unemployed, and a large share of the world's population has income levels at or below the poverty income threshold. They are helpful to employers, but they are harmful to both consumers and workers because they reduce overall output. They are harmful because their use puts people out of work. They will be adopted by profit seeking firms only if they reduce cost, and when this is the case, they will release humans to perform other useful tasks