Explanation:

• In addition to the Sangam literature, the Greek authors like Megasthenes, Strabo, Pliny and Ptolemy mention the commercial contacts between the West and South India.
• The Asokan inscriptions mention the Chera, Chola and Pandya rulers on the south of the Mauryan empire.
• The Hathikumbha inscription of Kharavela of Kalinga also mentions about Tamil kingdoms.
• The excavations at Arikkamedu, Poompuhar, Kodumanal and other places reveal the overseas commercial activities of the Tamils. Hence all statements are correct.