Object-oriented analysis （OOA） is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is （） . It determines how the various results are computed by the product and presents this information in the form of a （） and associated scenarios. The second is （） , which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is （） , which determines the actions performed by or to each class or subclass and presents this information in the form of （）.

The last step is （）

A．use-case modeling

B．class modeling

C．dynamic modeling

D．behavioral modeling

无效投标文件包括( )投标文件。

A．工期超过招标文件要求的
B．投标人的名称与资格预审时不一致的
C．以低于成本报价竞标的
D．投标文件的关键内容字迹模糊，无法辨认的