The correct answer is (b), Vaishnava Cult.
Shankardeva was a 16th-century Assamese saint, poet, social reformer, and philosopher. He is considered one of the most important figures in Assamese culture and literature. Shankardeva was a Vaishnava, a follower of Vishnu, one of the principal deities of Hinduism. He was a disciple of Madhavacharya, the founder of the Dvaita Vedanta school of philosophy.
Shankardeva’s teachings emphasized the importance of devotion to Vishnu and the practice of bhakti yoga, or the path of devotion. He also stressed the importance of social reform and education. Shankardeva’s teachings had a profound impact on Assamese society and culture. He is still revered by Assamese Hindus today.
The other options are incorrect.
(a) Shaiva Cult: Shaivism is a Hindu tradition that worships Shiva as the supreme deity.
(c) Advaita Cult: Advaita Vedanta is a Hindu philosophy that teaches that Brahman, the ultimate reality, is the only thing that exists.
(d) Dvaita-advaita Cult: Dvaita-advaita is a Hindu philosophy that teaches that Brahman and the individual soul are distinct but ultimately one.