Poor second-year students of all majors in public administration at a university have applied for student loans. All students who applied for student loans have paid their tuition. Some second-year students in public management majors use tuition after school to accumulate tuition. The university can only enroll students if the tuition fees are all collected. Some students from the university's business administration major also have tutors after school, but others have not paid the tuition fees. Based on this, all judgments except the following judgments must be true? ['Second-year impoverished students of all public administration majors at the university paid tuition fees.', 'Students who are tutors at this university may have poor second-year students in public administration.', 'Some people at the university are not registered, they may be business administration students.', 'The poor students in public administration majors at the university have successfully registered.']