Formal justice: refers to the equal treatment of the same event by individuals or authorities, and the control of all people according to a unified standard (not based on the position of the individual or the special group to which it belongs). According to the above definition, which of the following is forms of justice? ['National employment of civil servants.', 'Adjusting income disparity through tax leverage.', 'Establish a protected area to protect endangered organisms.', 'The government sets a guide price for a commodity that is well below the market price.']