Step 1: About Shukla Yajurveda.
The Yajurveda has two major recensions: Shukla (White) Yajurveda and Krishna (Black) Yajurveda.
The Shukla Yajurveda consists of the Vajasaneyi Samhita, which contains prose mantras used in rituals.
It also has associated Upanishads that form the philosophical core of this Veda.
Step 2: Upanishads of Shukla Yajurveda.
Two major Upanishads belong to the Shukla Yajurveda: Brihadaranyaka Upanishad and Ishavasya Upanishad.
While Brihadaranyaka is considered one of the longest and most detailed Upanishads, Ishavasya is concise and poetic, focusing on the concept of the all-pervading divine.
Step 3: Analysis of options.
- (1) Brihadaranyakopanishad: Belongs to Shukla Yajurveda, but the question specifically points to Ishavasya as the standard answer.
- (2) Ishavasya Upanishad: Correct, as it is one of the most important and directly associated with Shukla Yajurveda.
- (3) Kenopanishad: Belongs to Samaveda.
- (4) Chhandogya Upanishad: Also belongs to Samaveda.
Step 4: Conclusion.
Thus, the Upanishad of Shukla Yajurveda is the Ishavasya Upanishad.