Assistance-type social security system: refers to the state's establishment of sound social security rules and regulations to ensure that each member of society can receive assistance without encountering poverty when encountering various accidents. Social security benefits are paid to support their basic livelihood. Which of the following are features of such a safeguard system:. ['Nanjing Municipal Government decides to raise minimum living security.', 'All school-age children can enjoy nine-year compulsory education.', 'Set up a provident fund to provide social security for retirees.', 'Establish elderly health centers in various communities so that elderly people can get medical care near their homes.']