Mumbai, Apr 28: Trading in Futures and Options (F&O) segment of the National Stock Exchange, which failed to commence today due to technical fault, will start at 11.15 am. The trading in F&O segment could not start in the morning due to a technical snag and pre-open trading commenced at 11.00 am while normal trading would start at 11.15 am, NSE official said. The trading in F&O segment would close at normal time (3.30 pm) in the afternoon, he added. Bureau Report