Select the correct indirect form of the given sentence.
Nakul asked her, "How do you know that Rahul has told this to him?"
1
Nakul asked her how she knew that Rahul had told that to him.
2
Nakul asked her that how she has known that Rahul has told that to him.
3
Nakul asked her how she knew that Rahul has told that to him.
4
Nakul asked her that how she knows that Rahul had told that to him.