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A UML state transition diagram does not specify a set
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of object that work together to perform some action, because
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this is what a sequence diagram does instead. Conversely, the
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second one is correct. As we said, a state transition diagram
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describes the events that cause a transition from one state
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to another. Again, a UML state transition diagram does not
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specify the set of components in a system, because this
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is what a component diagram does, not a state transition diagram.
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As for the last one, this is correct,
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because, as we also discussed, a state transition diagram
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describes the actions that result from a state
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change, that is, the effects of such state change.
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