Explanation:

- Ur: This was the general assembly of a village, including non-Brahmin settlements. It was primarily concerned with the administration of the village.

- Khilya: This is not relevant in the context of Chola administration. It's not typically associated with village assemblies.

- Nagaram: This referred to the assembly in towns, usually dealing with trade and commerce-related matters.

- Sabha: This was the assembly in the villages inhabited predominantly by Brahmanas. It was a more formal gathering with committees to manage village affairs.