Identify the correct statements regarding the early Bhakti movement in South India:
I. Alvars and Nayanars travelled from place to place singing hymns in Tamil.
II. One of the major anthologies of compositions by the Alvars, Amuktamalyada, described as Tamil Vedas.
III. Karaikkal Ammaiyar and Andal were the women devotees of Nayanar and Alvar tradition.
IV. Both Nayanars and Alvar saints were revered by the Vellalas peasants.