Answer :
The action that CANNOT be reversed using the Undo command in Excel is -a) Deleting a tab in the workbook.
Deleting more than 20 rows of data in the workbook: This action can be reversed by the Undo command unless you exceed Excel’s limit of undo actions, which is typically 100.
Typing over the contents of a cell in your workbook: This action can be undone using the Undo command.
Deleting a tab in the workbook: This action cannot be reversed using the Undo command. Once a tab is deleted, all the data in that tab is permanently removed from the workbook.
Deleting a column in the workbook: This action can be reversed by the Undo command as long as you haven’t exceeded the limit of undo actions in Excel.
