Answer:
Upanishads
Step-by-step explanation:
"Sad" is the root and when prefixed "Upa" and "Ni" are added to it, it becomes Upanishads. Upa means nearness and Ni means totality. It means sitting near by devotedly. Upanishads contains difficult discussions to philosophical problems and were taught to the pupils by the gurus at the end of their course. Vedas have two portions ; Karma-Kanda and Jnana-Kanda. Upanishads belong to Jnana-Kanda. They are most popular Vedic text. They are also called Vedanta (End of Upanishads) because they represent the main aim of the Veda and contain the highest goal of the Veda as they deal with Supreme Bliss.