A concept proposed by Harding in The Tragedy of the Commons: a group of herders grazing together in a public pasture. A herdsman wants to raise an extra sheep to increase personal income, although he knows that there are too many sheep on the pasture After raising more, the quality of the pasture will be reduced, but he will increase if he does not increase others. Therefore, he will definitely choose to raise more sheep for gain, because the cost of grassland degradation is borne by everyone. If every herder thinks so , The grassland is degraded, and all herders will be lost, and the "tragedy of the commons" will be staged. The solution to the tragedy of the commons is to find a master for the grasslands, and the owners will naturally take measures to protect the grasslands. Regarding this text, what is the following understanding? ['All herders are selfish and consider only personal interests.', 'To avoid the "tragedy of the commons", it is necessary to set up and implement the responsibility for post management.', 'The solution to the "tragedy of the commons" is to privatize grasslands.', 'We all bear the cost of grassland degradation, which reflects the fairness and justice of society.']