Social security: refers to a series of social security systems that provide material security for the basic living rights of members of society through the redistribution of national income according to certain laws and conditions. Which of the following are not social security? ['State grants financial subsidies to areas with lagging development.', 'The society provides minimum living security for citizens.', 'The state provides material assistance to people with difficulties in living.', 'The society provides life security for retired employees.']