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If the system state is Shutdown then it can respond to which of the following message?

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If the system state is Shutdown then it can respond to which of the following message?

(a) restart()

(b) reconfigure()

(c) powerSave()

(d) all of the mentioned

This question was posed to me in semester exam.

My question is from Object Oriented Design using UML topic in section Design and Implementation of Software Engineering

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The correct choice is (d) all of the mentioned

Explanation: A restart() message causes a transition to normal operation. Both the powerSave() and reconfigure() messages cause a transition to a state in which the system reconfigures itself.

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