Which one of the following statements about coins struck during 200 BCE to 300 CE in the Indian subcontinent is not correct

Which one of the following statements about coins struck during 200 BCE to 300 CE in the Indian subcontinent is not correct?

1. The Indo-Greeks introduced bilingual and biscript legends on their coins.
2. The Kushanas- minted large quantities of gold coins as well as copper coins of low denomination.
3. The Satavahanas issued coins of silver, copper, lead and potin.
4. Absence of Negama coins suggests the declining power and authority of merchant guilds.