Consider the following statements regarding the Chola administration and military organization:

1. The Chola navy was a highly organized force, enabling expeditions as far as Southeast Asia.
2. Chola administration emphasized local governance, with village assemblies like the Ur and Sabha.
3. The Cholas adopted Persian naval strategies, which contributed to their success in maritime expansion.
4. Chola inscriptions in Tamil Nadu provide insights into a caste-based military hierarchy.

Which statements are correct?