问题详情

Which of the following statements about object oriented database is not correct？(72).
A．Each object has a unique object identify in the system
B．Encapsulation and inheritance are two important features of object oriented database
C．A subclass can inherit the attributes and methods of all its superclasses
D．A supereloss includes the attributes and methods at all subclasses请帮忙给出正确答案和分析，谢谢！