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 （1）.  It  determines  how  the  various  results  are  computed  by  the  product  and  presents  this information in the form of a   （2）    and associated scenarios. The second is   （3）  ， which determines the classes and their attributes. Then determine the interrelationships and interaction among the classes. The last step is   （4）  ， which determines the actions performed by or to each class or subclass and presents this information in the form of   （5）  .
（1）
A.use-case modeling 
B.class modeling 
C.dynamic modeling 
D.behavioral modeling 
（2）
A.collaboration diagram 
B.sequence diagram 
C.use-case diagram 
D.activity diagram 
（3）
A.use-case modeling 
B.class modeling 
C.dynamic modeling 
D.behavioral modeling 
（4）
A.use-case modeling 
B.class modeling 
C.dynamic modeling 
D.behavioral modeling 
（5）
A.activity diagram 
B.component diagram 
C.sequence diagram 
D.state diagram