The correct answer is (a) A.R. Rahman.
A.R. Rahman is an Indian film composer, music director, singer, songwriter, and record producer who works in Tamil, Hindi, Telugu, Malayalam, Kannada, Bengali, English, and Arabic films. He has won two Academy Awards, two Grammy Awards, a Golden Globe Award, a BAFTA Award, fifteen Filmfare Awards, and fourteen National Film Awards. He is the first Indian to win an Academy Award for Best Original Score.
Anu Malik is an Indian music director, composer, and singer. He has composed music for over 1,000 Hindi films and has won several awards, including six Filmfare Awards.
Sonu Nigam is an Indian playback singer who works in Hindi films. He has won four Filmfare Awards and has sold over 100 million records worldwide.
Kalyani-Anandji were an Indian music director duo who composed music for over 1,000 Hindi films. They won four Filmfare Awards.