单选题：In the context of object-oriented software engineering a compone

In the context of object-oriented software engineering a component contains __. @[D](1)

A. attributes and operations
B. instances of each class
C. roles for each actor (device or user)
D. set of collaborating classes




A.attributes and operations
B.instances of each class
C.roles for each actor (device or user)
D.set of collaborating classes


答案：D