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 （）.

It determines how the various results are computed by the product and presents this information in the form of a（）and associated scenarios.

A．collaboration diagram

B．sequence diagram

C．use-case diagram

D．activity diagram

以下哪种做法是在催办、查办工作过程中都共同具有的( )

A．对公文产生实效的全部过程都需要给予监督控制

B．查办、催办之目的都要求能按时、按质、按量的将有关事务办完

C．查办、催办都以一份具体的公文为单位展开

D．查办、催办都是带着监督性质的管理活动