In the textbook’s account, what is the rhetorical role of “fa-qad kudhdhiba” in this conditional passage?

Ījāz al-Ḥadhf: Forms of Ellipsis and Evidence for Recovering the Omitted

• It cancels the condition
• It gives the reason for an omitted consoling response in its place
• It modifies an omitted subject
• It is merely a supplication