Step 1: Identification of the Prasthana Trayam Components.
The Prasthana Trayam, the foundational triad of Vedanta, encompasses three primary texts: - A. Upanishads: These texts form the bedrock of Vedantic thought, embodying ultimate knowledge and the realization of the self. - B. Srimad Bhagavadgita: Regarded as Vedanta's paramount scripture, the Bhagavadgita provides ethical direction and elucidates pathways to spiritual freedom. - D. Brahmasutra: This treatise synthesizes and expands upon the doctrines of the Upanishads and Bhagavadgita, establishing the framework of Vedanta philosophy. - C. Puranas: While significant in Hinduism, the Puranas are not part of the Prasthana Trayam.
Step 2: Determination of the Correct Set. The accurate selection comprises A, B, and D exclusively, corresponding to option 2.
Final Answer: \[ \boxed{\text{The correct answer is 2. A, B and D only.}} \]