Correct Option: D

Gold Coins attributed to Harsha depict on the reverse Shiva-Parvati. The Gupta period is considered the "Golden Age" of classical India. This was a time when great universities flourished in Nalanda and Takshashila, and great scientists, such as the mathematician and astronomer Aryabhatta, who is credited with the concept of Zero among his many achievements, helped create an atmosphere of tremendous creative impulse.