Which of the following is TRUE about the dual－education system in Germany？A．Students serve

Which of the following is TRUE about the dual-education system in Germany？

A．Students serve as apprentices in firms before formal schooling.

B．Students taking dual-education can get two certificates.

C．Students qualified for university can sign up the programme.

D．Students are examined by employers during the training.

请帮忙给出正确答案和分析，谢谢！