Which of the following statements regarding the Undo button is correct?

The Undo button can only undo the most recent adjustment of the active worksheet.

The Undo button can undo as many adjustments as you want, including those made before the worksheet was last saved.

$Ctrl+Z$ is the hotkey for the Undo button.

$Ctrl+Z$ can bring up the drop$-$down list from the Undo button.