What action must be taken when a variable is deleted from a workbook?

When a variable is deleted from a workbook, it is essential to understand that this action impacts any worksheets that utilize that variable. Therefore, the worksheets that reference the deleted variable must be modified to ensure that they do not contain any references to it. This is critical because if those worksheets retain references to a variable that no longer exists, it can lead to errors or unexpected behavior when the workbook is used.

The other choices, while they may touch on related actions or consequences, do not accurately capture the required steps following the deletion of a variable. For instance, the assertion that the variable will be automatically removed from all buttons does not address the necessity for manual updates to worksheets that depend on that variable. Similarly, the implication that new variables must replace the deleted variable overlooks the need to carefully manage existing references. Finally, the notion that a deleted variable will be restored automatically is misleading, as deleted variables do not have an automatic recovery mechanism. Therefore, the focus remains on the modifications needed within worksheets to maintain functional integrity after the deletion.