The foreign institutional investors (FIIs) were net sellers to the tune of Rs 277.14 crore in the futures & option segment on Friday.According to data released by the NSE, FIIs were net sellers of index futures to the tune of Rs 179.52 crore while they bought index options worth Rs 13.29 crore. They were net sellers of stock futures to the tune of Rs 104.07 crore and they sold stock options worth Rs 6.85 crore.