Explanation:

One of the most important administrative units of the Cholas was Nadu. Each nadu was headed by a Nattar while the council of nadu was named nattavai. The responsibility of the village administration was entrusted to the village assembly called Grama Sabha, the lowest unit of the Chola administration. It was involved in the maintenance of roads, tanks, temples and public ponds. The village assembly was also in charge of payment of taxes due from the villages to the King’s treasure.