According to the original meaning of science, science is rational; philosophy is highly rationalized, and of course it is also science. Therefore, in the history of philosophy, it has long played an all-inclusive role of "science of science" until the birth of Marxist philosophy, It is necessary to properly handle the relationship between science and philosophy, but in ancient universities, a doctor of philosophy is a real doctor of science. Based on this text, Which of the following inferences are correct:. ['Science has always been a branch of philosophy.', 'Marxist philosophy science and philosophy completely separate the relationship.', 'Philosophy and science are rational.', 'Science is philosophy, philosophy is science.']