SYMBOL FOR NIFTY CONTINOUS FUTURES

HI,

I WANTED TO KNOW THE SYMBOL FOR NIFTY 50 FUTURES CONTINOUS .

ALSO WANTED TO KNOW THE TIME DURATION I CAN FETCH HISTORICAL DATA FOR NIFTY 50 INDEX FUTURES AND NIFTY 50 OPTION FOR VARIOUS TIME FRAMES LIKE 1MIN 5MIN OR 15MIN. IS IT LIKE PAST 3 MONTHS TO 1 YEAR OR DOES IT DEPEND ON THE TIMEFRAME ? IF SO, REQUESTING TO PUBLISH THE DETAILS ALSO IS THERE ANY WAY TO GET 3 YEARS OF ALL PREVIOUS NIFTY 50 OPTION EXPIRY OF NIFTY 50 FUTURES OR NIFTY 50 INDEX DATA FOR A FEE ON 1 IN,5MIN 0R 15MIN TIME FRAME