The Jabala Upanishad is conventionally credited with the earliest clear statement of all four ashramas: brahmacharya, grihastha, vanaprastha and sannyasa. Jabalopanishad fits that evidence because it matches the specific chronology, agency and function contained in the question. A comparison with the alternatives is useful: Rigveda, Katha Upanishad and Chhandogya Upanishad are genuine historical terms or names, but each belongs to a different office, patron, text, region or sequence. The compact memory link is therefore Jabalopanishad together with the factual context above, not the isolated option letter.