The Gupta inscription inscribed above the Girnar inscription of Rudradaman is dated to the 5th century C.E. This is based on historical and epigraphical evidence. The Gupta Empire, which was one of the most significant dynasties in ancient India, flourished during the 4th to 6th centuries C.E. The Gupta period is known for its notable achievements in art, culture, and administration.

The inscription above the Girnar inscription of Rudradaman suggests a later date, specifically during the 5th century C.E., which is well within the timeframe of the Gupta Empire. This dating aligns with the historical context and the Gupta dynasty's prominence during that period. 

So,the correct option is [3].