Option b is the correct answer. Emperor Vima Kadphises of the Kushan Empire, ruling from approximately 113 to 127 CE , is credited with issuing gold coins for the first time in the empire's history. These coins, weighing about eight grams, were accompanied by existing copper and silver currency. He introduced gold coins referred to as 'Dinars.' These coins featured intricate depictions of Shiva, Nandi, and the Trishul, alongside the inscription of his title 'Maheswara.' Trade with the Roman Empire likely facilitated their gold acquisition. The coins also bore various Buddhist and Hindu symbols, showcasing cultural syncretism. Vima's reign reflected prosperity, cultural exchange, and economic growth in the Kushan Empire.