BNF has been really bullish since it broke its major MA line (Weekly and Monthly SMAs)
Shorting levels: For this expiry week, 28808 is major support, next major support is 28030, if any of these are broken intermediary high oi strike price supports such as 28500 are possible. These levels ca n be used to short the stocks
Long levels: Above 29233, there is long time resistance of 29350, then 29600 and 29860 beyond this its got limited resistance from high OI strike prices, aprt from that it is strong till 30750
Further a trend-zone can be observed like in Nifty, if it breaks either side, good opportunities.