Who among the following was India’s longest serving prime minister as of April 2021?

Jawaharlal Nehru

The correct answer is Option 1 - Jawaharlal Nehru

As of April 2021, the longest-serving Prime Minister of India was Jawaharlal Nehru, who held office for 17 years and 65 days. He served as Prime Minister from August 15, 1947, to May 27, 1964.