Government social management refers to the organized activities of the government in the management of social affairs in accordance with the law in order to promote public interests by integrating social resources and mobilizing social forces. Which of the following belongs to government social management? ['The government provides minimum living security for low-income people, and levies personal income tax on high-income people.', "Government's decision to close cement plants with severe air pollution.", 'A school organizes volunteer activities to help orphans.', 'An administrative department organizes experts to formulate product quality standards.']