Select the correct indirect form of the given sentence.

Nakul asked her, "How do you know that Rahul has told it to him?"

Nakul asked her how she knew that Rahul had told that to him.

The correct indirect form of the given sentence is:

Nakul asked her how she knew that Rahul had told that to him.

The other options are incorrect:

• "Nakul asked her that how she has known that Rahul has told that to him." This is incorrect because the reporting verb "asked" is in the past tense, but the reported question is in the present perfect tense. This means that the reported question is describing an action that started in the past and continues to the present, but the speaker is talking about the past.
• "Nakul asked her how she knew that Rahul has told that to him." This is incorrect because the reported question is in the present tense ("has told"), but the reporting verb "asked" is in the past tense. This means that the reported question is describing an action that is happening in the present, but the speaker is talking about the past.
• "Nakul asked her that how she knows that Rahul had told that to him." This is incorrect because the reporting verb "asked" is in the past tense, but the reported question uses the subjunctive mood ("knows"). This is not typically used in indirect questions.