单选题：The state transition diagram __.

The state transition diagram __. @[D](1)

A. depicts relationships between data objects
B. depicts functions that transform the data flow
C. indicates how data are transformed by the system
D. indicates system reactions to external events




A.depicts relationships between data objects
B.depicts functions that transform the data flow
C.indicates how data are transformed by the system
D.indicates system reactions to external events


答案：D