●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 （71）. It determines how the various results are computed by the product and presents this information in the form. of a （72） and associated scenarios. The second is （73） , which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is （74） , which determines the actions performed by or to each class or subclass and presents this information in the form. of （75） .
（71）
A.use-case modeling
B. class modeling
C. dynamic modeling
D. behavioral modeling
（72）
A. collaboration diagram
B. sequence diagram
C. use-case diagram
D. activity diagram
（73）
A. use-case modeling
B. class modeling
C. dynamic modeling
D. behavioral modeling
（74）
A.use-case modeling
B. class modeling
C. dynamic modeling
D. behavioral modeling
（75）
A. activity diagram
B. component diagram
C. sequence diagram
D. state diagram