Answer : 1. "तमिलनाडु"
Explanation :

Recently archaeologists found stone inscriptions from the 11th and 16th centuries in Pazhanchervazhi village near Kangayam, Tamil Nadu, which include 'Grantham' and Tamil scripts. Grantham, a historical script that was once written in Sanskrit script in Southeast Asia and Tamil Nadu. Originally named for literary works in Sanskrit, it later influenced Malayalam and became Arya Ezhuthu. The prevalence of the treatise in South India highlights its historical importance in language development, especially in the borrowing of words and grammar rules from Sanskrit by Malayalam.