The correct option is A Saint Kabir
In Hinduism, two forms of devotions are found. one is Sagun bhakti and another one is Nirguna Bhakti. Sagun bhakti has faith in the physical form of God and Nirguna bhakti has its faith in formless supreme God. Kabir was a nirguna saint who believed in formless supreme God. He wanted to remove the differences based on caste and religion. He condemned the superstitious cults, the ritualism, the doctrine of both the Hinduism and Islam. His teachings are collected in the "Bijaka". His followers are known as kabirpanthis.