Indian stock markets, led by the Sensex and Nifty, extended their rally for a second day, defying a global tech sell-off as easing crude oil prices and strong performance from IT sector blue-chips boosted investor confidence.Photograph: Shailesh Andrade/ReutersKey PointsThe BSE Sensex surged 579.48 points (0.75%) to 77,502.12, while the NSE Nifty rallied 169.85 points (0.71%) to 24,175.70, marking a second consecutive day of gains.Easing Brent crude oil prices, which dropped 1.45 per cent to USD 70.53 per b ...