What is "the knowledge that has come to you" referring to in this āyah?

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

1. It refers to the change of the prayer direction (qibla) to the Kaʿba. [Ibn ʿAbbās]
2. It refers to the clarification that the religion of Allah is Islam.
3. It refers to the Qurʾān.
4. It refers to the knowledge that these people were misguided.