State compensation: Refers to the system of compensation for victims by the state's and its staff members' illegal exercise of their powers, infringements on the legitimate rights and interests of citizens, legal persons, and other organizations and causing damage. According to this definition, in which of the following situations should the state be liable? ? ['Public security investigator Zhao killed the suspect during interrogation.', 'Business administration authorities revoke the business license of an illegal operating company.', 'Post office causes losses to customers during postal delivery.', "Bank staff misappropriating depositors' funds using their positions."]