The zone of 11,700-11,800 is crucial for the index, as 50-DMA is placed in this region and the change of polarity concept comes into play around this zone as well. Meanwhile, the level of 11,980-12,040 would continue to act as a stiff resistance zone on the upside. Stocks in news: IRB Infrastructure Developers, Maruti Suzuki India, KNR Constructions, Welspun Corp, NBCC, Zensar Technologies.