Option chain is not giving any conclusive levels so we look at charts. Banknifty finished on daily chart as a doji candle with higher high and higher low. with Nifty looking extremely bullish, BNF can't go low so buy at support which coincides with Nifty support. The correct buying area is one which is marked on chart but I don't see it coming there as of tomorrow.
All the best. Happy trading.
All the best. Happy trading.