What is it that the angels "disclosed"?

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

1. It refers to their saying: "Will You place upon it one who causes corruption therein?" [Al-Suddī]
2. It refers to the obedience and submission to Allah which they showed when they passed by Adam's body. Iblīs said: "If he is favoured over you, what will you do?" They said: "We will obey our Lord." Iblīs then said to himself: "If I am favoured over him, I will destroy him, and if he is favoured over me, I will disobey him." [Muqātil]