The Vedatrayi refers to the three main Vedas in Hinduism, namely the Rig Veda, Yajur Veda, and Sama Veda. These texts are considered the oldest scriptures in Hinduism and contain hymns, rituals, and philosophical teachings. Option 4, Athar Veda, is not a part of the Vedatrayi. The Athar Veda is the fourth Veda and is considered a separate collection of hymns and rituals. While it is not part of the Vedatrayi, the Athar Veda is still an important text in Hinduism and contains insights into ritualistic practices, cosmology, and philosophy. It is worth noting that there are other texts that are considered part of the Vedic corpus, such as the Brahmanas and Upanishads, which expand on the teachings of the Vedas.