Which one among the following about Kodumanal is correct?

Kodumanal is a renowned archaeological site located in the Erode district of Tamil Nadu, situated on the northern bank of the Noyyal River. It is identified as the 'Kodumanam' mentioned in the Sangam literary work Patitrupathu.

The site is significant for its evidence of a flourishing industrial and trade centre during the Sangam era (Iron Age/Early Historic period). Major archaeological findings include:

• Megalithic burials such as cairn circles and cists.
• A major bead-making industry involving semi-precious stones like beryl, quartz, and carnelian.
• Evidence of iron smelting and steel production.
• Pottery shards inscribed with Tamil-Brahmi script, indicating early literacy.
• Roman coins and artifacts, proving extensive maritime trade links with the Roman Empire.