Four high school students, A, B, C and D, got together 30 years after graduation  Now, they have become entrepreneurs, university teachers, singers and accountants, and each has only one identity, which is not repeated  When they were in high school, they made the following predictions about their future careers: A and B would not become singers; B and C would become accountants; C and D would not become entrepreneurs; and D and B would not become university teachers
Now it seems that only their predictions about accountants are correct
Entrepreneur, singer, accountant, university teacher.