单项选择题
Which of the following statement is correct? _____
在下面的关于用例图的说法中,哪个是正确的? _____
A.Use case modeling is both action and data oriented.
B.A use case may be initiated by an actor to invoke a certain functionality in the system.
C.An actor doesn't represent a coherent set of roles all the time that one plays when interacting with these use cases.
D.A class is an abstract data type, but it doesn't support inheritance.