Option d is the correct answer. The Allahabad pillar contains one of the pillar edicts of Ashoka. However, the pillar is also notable for containing later inscriptions attributed to Samudragupta. These inscriptions, known as the Prayag Prashasti or the Allahabad Pillar Inscription, were composed by his court poet Harishena. They describe Samudragupta's military conquests, his benevolence towards other rulers, his religious tolerance, and his personal achievements. Allahabad Pillar (Nagasena) calls him Kaviraja because of his ability in composing verses. The inscriptions are considered to be one of the finest examples of Sanskrit poetry and a valuable source of historical information. The Allahabad pillar also has inscriptions by the Mughal emperor Jahangir, who ruled in the 17th century CE