The Evidence Act treats examination-in-chief, cross-examination, and re-examination differently for leading questions.
Because the permission to lead applies only to the adversarial stage of questioning, the correct answer is Cross-examination.
Considering why each stage exists explains the rule on leading questions.
The adversarial purpose of cross-examination is precisely why the law permits leading questions there and nowhere else without the court's leave.
Therefore, the correct answer is Cross-examination.