The correct answer is A. Restore button.
A restore button is a button that is used to restore a property’s value to its previous state. It is often used in dialog boxes that allow users to make changes to a property. If the user changes their mind about the change, they can click the restore button to undo the change.
A reset button is a button that is used to reset a property to its default value. This is often used when a user has made a mistake and wants to start over.
A default button is a button that is selected by default when a dialog box is opened. This is usually the button that will perform the action that the user is most likely to want to do.
A back button is a button that is used to go back to the previous screen. This is often used in web browsers and other applications that allow users to navigate through multiple screens.