The Doctrine of Lapse, introduced and aggressively implemented by Lord Dalhousie, had far-reaching consequences for British expansion in India. Analyze the following statements regarding the policy and identify which are incorrect:

1. The Doctrine was introduced solely by Lord Dalhousie during his tenure as Governor-General between 1848 and 1856.
2. The British annexed Awadh due to a lack of a male heir, and they took over Jhansi by claiming the kingdom was poorly governed.
3. Under the Doctrine of Lapse, Indian rulers were forbidden from adopting a successor without British approval.
4. The policy contributed to the growing discontent among Indian rulers and played a significant role in triggering the 1857 Rebellion.

Which of the above statements is/are correct?