Which one of the following sources states that Srinagar was built by Ashoka?

Rajatarangini ("The River of Kings") is a metrical legendary and historical chronicle of the north-western Indian subcontinent, particularly the kings of Kashmir. It was written in Sanskrit by Kashmiri historian Kalhana in the 12th century CE. The work consists of 7826 verses, which are divided into eight books called Tarangas ("waves").The Rajataringini provides the earliest source on Kashmir that can be labeled as a "historical" text on this region.