Which of the following is considered an engineering control?

Question 1 options:

installing a mechical palletizer to transfer heavy boxes from a packaging station to a shipping skid
adding an additional worker to a palletizing station so that workers only lift every other heavy box
pushing and/or pulling the heavy boxes from the packaging station to the skid versus lifting each heavy box
introducing a job rotation program so that workers only lift heavy boxes for a quarter of a shift
training a worker regarding safe lifting techinques to manually handle the heavy boxes