The grounded theory refers to the establishment of a theory on the basis of empirical data. Researchers generally do not have theoretical assumptions before starting the study. They start directly from actual observations, summarize the empirical summary from the original data, and then rise to the theory. Based on the above definitions, which of the following are in line with grounded theory? ['A postgraduate conducted a year-long experiment to verify the inverted U-shaped curve relationship between pressure and success. The experimental results were not consistent with pre-judgment. He thought that there might be problems in the design of the experiment.', "A professor has continuously observed the laws of children's cognitive development through continuous observations of their daughters from 3 to 7 years old, but these conclusions are still controversial in academic circles.", 'A company developed a personality test based on the nine personality theory, and the company employees tested it. The test results are very similar to the actual situation.', 'A medical institution used questionnaires, interviews, and other forms to study the interaction effects of machinery and equipment on medical staff and patients, and found that certain equipment obviously made patients uncomfortable, so the equipment was improved.']