Question: We want to add a button to the tally counter in Section 8.2 that allows an operator to undo an accidental button click. Provide a

We want to add a button to the tally counter in Section 8.2 that allows an operator to undo an accidental button click. Provide a method public void undo() that simulates such a button. As an added precaution, make sure that the operator cannot click the undo button more often than the count button.

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