Option c is the correct answer. Sufi saint whose verses have been incorporated in the religious book 'Adi Granth' of the Sikhs is Fariduddin-Ganji-Shakar, also known as Baba Farid. He was a 13th-century Punjabi Muslim mystic and poet, who belonged to the Chishti order. His hymns are among the oldest compositions in the Adi Granth and reflect his love for God and detachment from the world. The Adi Granth also contains the verses of other Hindu and Muslim saints, such as Kabir, Namdev and Sheikh Farid.