'ऑपरेशन ब्ल्यु स्टार' ही लष्करी कारवाई झाली तेव्हा भारतीय लष्कराचे प्रमुख हे होते.

The correct answer is Option B (General Arun Kumar Vaidya).

Key Points:
• Operation Blue Star and Military Leadership:
• 'Operation Blue Star' was an Indian military operation ordered by Prime Minister Indira Gandhi between 1 and 10 June 1984 to flush out armed Sikh militants led by Jarnail Singh Bhindranwale from the Golden Temple complex in Amritsar, Punjab.
• At the time of this operation, General Arun Shridhar Vaidya was serving as the 13th Chief of the Army Staff (COAS) of the Indian Army (holding office from 1983 to 1986).
• Important distinction regarding other options:
• Option (3) Major General Kuldip Singh Brar was the operational ground commander (9th Infantry Division) in charge of directing the troops on-site at Amritsar, not the Chief of the Army Staff.
• Options (1) and (4) were Army Chiefs in the 21st century (Gen. V. K. Singh: 2010–2012; Gen. Bikram Singh: 2012–2014).
• Key Takeaway: During Operation Blue Star in June 1984, General Arun Kumar Vaidya was the Chief of the Army Staff, while Maj. Gen. K. S. Brar led the operation on the ground.