Correct Answer - Option 1 : CTRL + Z
The correct answer is CTRL + Z.
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CTRL + Z is a shortcut key to Undo the operation or task.
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It erases the last change done to the document, reverting it to an older state.
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In some more advanced programs, such as graphic processing, undo will negate the last command done to the file being edited.
Some important shortcut keys in MS Word are -
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Ctrl + A -- Select all contents of the page.
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Ctrl + B -- Bold highlighted selection.
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Ctrl + C -- Copy selected text.
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Ctrl + X -- Cut selected text.
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Ctrl + N -- Open new/blank document.
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Ctrl + O -- Open options.
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Ctrl + P -- Open the print window.
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Ctrl + F -- Open find box.
