Who has designed the National Flag of India? 

Pingali Venkayya

The correct answer is Option 3 - Pingali Venkayya

The National Flag of India was designed by Pingali Venkayya, a freedom fighter from Andhra Pradesh. He first proposed the design in 1921, and it was adopted by the Indian National Congress in 1931.

The flag is a horizontal tricolour of saffron, white, and green, with a 24-spoked Ashoka Chakra in the center of the white band. The saffron represents courage and sacrifice, the white represents peace and truth, and the green represents faith and prosperity. The Ashoka Chakra represents the wheel of law and order.

Venkayya's design was inspired by the flag of the Indian National Congress, which was also a horizontal tricolour of saffron, white, and green. However, the Congress flag did not have the Ashoka Chakra in the center.

Venkayya's design was adopted by the Indian National Congress in 1931, and it was used by the Indian National Army during World War II. After India gained independence in 1947, the flag was adopted as the national flag of India.