Which one of the following devotional saints have projected the philosophy of Confirmation?

Vallabhacharya is also known as Vallabha. - He was an Indian Telugu philosopher who founded the Krishna-centered Pushti sect of Vaishnavism in the Braj region of India. • He founded the philosophy of Shuddha advaita (Pure Nondualism). Bhagat Sadhna, also called Sadhna Qasai, was a north Indian poet, saint, mystic and one of the devotees whose hymn was incorporated in Guru Granth Sahib. - Ramanand was a 14th-century Vaishnava devotional poet saint. - Madhva Acharya, and also known as Pūrna Prajña and Ānanda Tirtha, was a Hindu philosopher and the chief proponent of the Dvaita (dualism) school of Vedanta. - Madhva called his philosophy Tatvavāda meaning "arguments from a realist viewpoint".