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Question 2. Object-Oriented Design and Protocols: Focussing on one aspect of the partial specification of the ATM When the machine is idle, a greeting message

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Question 2. Object-Oriented Design and Protocols: Focussing on one aspect of the partial specification of the ATM "When the machine is idle, a greeting message is displayed", provide a list of candidate protocols for this responsibility. [2 marks per complete protocol]

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