Hazrat Nizamuddin was a Sufi saint from which order?

What is the primary teaching of the Bhakti Movement?

Who were the Nayanars, and whom did they worship?

Read the following excerpt and answer the questions that follow:

"Sufism, Mystical movement within Islam that seeks to find divine love and knowledge through direct personal experience of God. It consists of a variety of mystical paths that are designed to ascertain the nature of mankind and God and to facilitate the experience of divine love and wisdom in the world."

(Source: https://www.britannica.com/summary/Sufism)

(a) Where did Sufism originate, and how did it spread to India?

(b) What does Sufism regard as necessary for gaining the knowledge of God?