Option 1: Chandrashekhar Azad - Chandrashekhar Azad was a revolutionary freedom fighter, but "Inquilab Zindabad" was not his slogan. Alert - The correct answer is not option 1.
Option 2: Subhash Chandra Bose - Subhash Chandra Bose was a prominent leader in the Indian independence movement, but "Inquilab Zindabad" was not his slogan.
Option 3: Bhagat Singh - Bhagat Singh, a prominent revolutionary and martyr, is known for giving the slogan "Inquilab Zindabad." The slogan became popular during the Indian independence movement.
Option 4: Iqbal - Allama Iqbal, a renowned poet, philosopher, and politician, is known for his contribution to the Indian independence movement, but "Inquilab Zindabad" was not his slogan.
Therefore, the correct answer is option 3, Bhagat Singh.