Дайте краткий отрицательный ответ ** вопрос: "Had he written his letter before you came?".

Question

Дайте краткий отрицательный ответ на вопрос: "Had he written his letter before you came?".

Answer 1

No, he had not
No, he hadn't

Answer 2

No,he didn't .
Думаю надо ответить так