Which of the following statements regarding Dr.B.R. Ambedkar is correct? Select the correct answer from the code given below the statements?

1. He founded Siddharth College.

2. He started his journal Mook Nayak in 1920.

3. He founded Depressed Class Institute in 1922.

4. He was the first Defence Minister of India.

Code :

U.P.P.C.S. (Pre) 2005