The correct option is C Both A and B
He was born in 598 A.D. His birthplace is believed to be Bheenmal (Jalore), Rajasthan. He was the chief astronomer in the Gupt period. At the age of 30, he wrote a book on astronomy called 'Brahmsfut Siddhanta' He also wrote another book called 'Khandkhadyakam' which is a book on trigonometry. He has given easy methods to write square root in his book. Brahmgupt's special contribution has been in in the field of geometry.