The correct answer is option 3: Rudra.

Option 1: Varun is not the correct answer. The Varun option is not an indigenously built Weapon System Integrated helicopter handed over to the Indian Army by Hindustan Aeronautics Ltd. Therefore, Varun is not the correct answer.

Option 2: Indra is not the correct answer. Indra is not an indigenously built Weapon System Integrated helicopter handed over to the Indian Army by Hindustan Aeronautics Ltd. So, Indra is not the correct answer.

Option 4: Shiva is not the correct answer. Shiva is not an indigenously built Weapon System Integrated helicopter handed over to the Indian Army by Hindustan Aeronautics Ltd. Thus, Shiva is not the correct answer.

The correct answer, option 3: Rudra, is an indigenously built Weapon System Integrated helicopter handed over to the Indian Army in February 2013 by Hindustan Aeronautics Ltd.