Consider the following statements about Leopold von Ranke and his contribution to scientific history:

1. Ranke is credited with introducing the concept of objectivity in history.
2. He emphasized the use of primary sources such as official documents and letters.
3. Ranke rejected the use of narrative history and focused solely on analyzing statistics and data.
4. His goal was to describe events “as they actually happened” (wie es eigentlich gewesen).

Which of the above statements are correct?