Which of the following statements regarding Post-modernism in historiography are correct?

1. Post-modernist historians argue that history cannot be objective, as all historical narratives are shaped by cultural and social contexts.
2. Post-modernism challenges the traditional notion of a single, unified narrative of history.
3. Post-modernists emphasize that historical facts are independent of interpretation and should be presented as such.
4. The Post-modernist approach often focuses on marginalized voices and micro-histories.