The correct answer is option 2, Madras Regiment. Lance Naik Hanmanthappa Koppad, who was buried alive under snow by an avalanche at Siachen Glacier, was a soldier of the Madras Regiment.

To understand the context better, it is important to know that Lance Naik Hanmanthappa Koppad`s heroic story received widespread attention in 2016. He, along with nine other soldiers, was buried under 25 feet of snow after an avalanche hit their post at an altitude of 19,600 feet in the Siachen Glacier in Jammu and Kashmir, India.

The Indian Army conducted a massive search and rescue operation to find the soldiers, and after six days, Lance Naik Hanmanthappa Koppad was miraculously found alive. He was immediately evacuated to the Army`s Research and Referral Hospital in New Delhi but unfortunately succumbed to his injuries.

Although options 1 (Dogra Regiment), 3 (Rajput Regiment), and 4 (Jat Regiment) are also regiments of the Indian Army, the correct answer is option 2, Madras Regiment.