Correct Answer - Option 4 : B
The correct answer is Ctrl+Z.
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Ctrl+Z shortcut use for Reverse your previous action & called is Undo.
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Ctrl + V shortcut use for any copy data paste using that key.
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Ctrl+Y shortcut use for reverse action of undo.
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Ctrl+x shortcut use for cut any data and paste that data anywhere else.
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Ctrl+A shortcut use for Select all data.
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Ctrl+C shortcut use for copy data.