Mandatory social control refers to the process by which social management systems use mandatory means to establish and maintain social order. Based on the above definitions, Which of the following are not compulsory social controls (). ['A factory penalizes Zhao for disciplinary violations according to factory regulations.', 'The court sentenced the suspect Li to three years in prison.', 'The government strongly advocates learning from Sun Yiwu.', 'The school gave a warning to Zhang, a student who cheated on the exam.']