Consider the following statements regarding this transformative period in ancient South Asian history:

1. Archaeological evidence from Mohenjodaro indicates a neglect of urban infrastructure towards the end of the Harappan civilization, with garbage accumulation on streets, breakdown of the drainage system, and construction of inferior housing.
2. Theories explaining the decline of the Harappan civilization include environmental factors such as deforestation, needed for fuel in brick baking and copper smelting, and overgrazing by large herds of animals, along with natural disasters like floods in specific regions.
3. Following the decline of their urban centers, Harappan society saw a shift in population dispersal, with people moving from established sites in Sind and west Punjab to new, smaller settlements in the east and south, indicating a significant transformation in settlement patterns.

Which of the above statement/s is/are correct?