Which of the following ambassadors was sent by Seleucus I Nicator to the court of Chandragupta Maurya?

Megasthenes was a Greek historian and diplomat who was sent as an ambassador by the Hellenistic king Seleucus I Nicator to the court of Chandragupta Maurya, the founder of the Mauryan Empire in Pataliputra. Megasthenes wrote the famous book 'Indica', which provides detailed insights into Mauryan administration and society.