Who is also known as Frontier Gandhi?

The correct answer is Option 2 - Abdul Gaffar Khan

Abdul Ghaffar Khan, (born 1890, Utmanzai, India—died Jan. 20, 1988, Peshawar, Pak.), the foremost 20th-century leader of the Pashtuns (Pakhtuns, or Pathans; a Muslim ethnic group of Pakistan and Afghanistan), who became a follower of Mahatma Gandhi and was called the “Frontier Gandhi.”