What is the meaning of the word "ḥiṭṭah" mentioned in this āyah?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. It means "seek forgiveness". Ibn Qutaybah explained that it is a word they were commanded to say in the sense of seeking forgiveness, derived from (ḥaṭṭa), meaning: "remove from us our sins" (ḥuṭṭa ʿannā dhunūbanā). [Ibn ʿAbbās, Wahb]
2. It means "Say: this matter is true as you were told". [Al-Ḍaḥḥāk from Ibn ʿAbbās]
3. It means 'there is no god but Allah'. Ibn Jarīr al-Ṭabarī explains, saying, "The meaning then would be: say that which will remove (yaḥuṭṭu) from you your sins, and that is the statement 'there is no god but Allah'."