In today’s trading session, we are likely to witness a roller-coaster ride on the eve of F&O expiry of December series. As far as support is concerned for the Nifty, immediate support is seen around the level of 10,450, and a sustainable move below this support level may drag the index lower up to the level of 10,410. On the upside, the zone of 10,540-10,550 is likely to act as a strong barrier.