Option c is the correct answer. Shahbazgarhi is a historic site in Mardan District of Khyber Pakhtunkhwa, Pakistan. It contains ancient rockinscriptions that are cut into two large rock boulders and written in the Kharosthi script. Created during the 3rd Century BCE by Ashoka, the renowned Mauryan emperor, these inscriptions provide insights into his policies and ethical messages for his subjects. The Persian invasion introduced the Kharosthi script, an Iranian writing form, which gained popularity in northwestern India, leading to the use of this script for some of Ashoka's edicts.