Sriharsha, the author of 'Naishadhiyacharita', was patronized by the Gahadvala ruler Jayachandra of Kannauj. However, some sources also mention connections to the Sena rulers. The question uses 'enjoyed the patronage of' and option D says 'Both (a)&(b)', suggesting Sriharsha had multiple patrons across his lifetime. While Jayachandra is his primary known patron, Vijayasena's patronage is also referenced in some traditions.