The correct answer is option 1: Kanishka. The Saka Era, also known as the Shalivahana Era, was started by the great Indian emperor Kanishka. It is a calendar system that is still used by the Government of India. The Saka Era was initiated in 78 AD, marking the ascension of Kanishka to the throne. This era is based on the lunar calendar and is widely used in various government documents, official communications, and historical records in India. Kanishka was a prominent ruler of the Kushan Empire, which spread its influence over a large part of Central Asia and India during the 2nd century AD. He was known for his military prowess, patronage of Buddhism, and efforts to promote cultural exchange in his empire.