Explanation:

- A.R. Rahman is a renowned Indian composer and musician known for his work in film music.

- He has been recognized with Grammy Awards for his contributions to music.

- Option:1 - 1 Grammy Award is not correct. He has won more than one.

- Option:2 - 4 Grammy Awards is not accurate. He did not win this many.

- Option:3 - 2 Grammy Awards is correct. He won for "Slumdog Millionaire."

- Option:4 - 3 Grammy Awards is incorrect as he won fewer awards.