Refer to the table below,which shows the results of payback,net present value,and internal rate of return analysis of four projects.Which is preferred by the payback criterion? 
Definitions:
Pole Pieces
Components in an electric motor or generator that enhance the magnetic field produced by the winding.
Permanent Magnet Motors
Electric motors that utilize permanent magnets in the rotor to create a constant magnetic field, improving efficiency and reducing energy consumption.
Electromagnetic Field Coils
Coils of wire that generate a magnetic field when an electric current passes through them, used in various electrical and electronic devices.
Battery
A device composed of one or more electrochemical cells that store and provide electrical energy through chemical reactions.
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