Chip makers were also among the top five percentage gainers in the Nasdaq 100 since the index closed at its 2015 low on Aug. 25, with SanDisk topping the list with a 70 percent jump on the back of a takeover bid from Western Digital.
In the context of the input sentence, determine the relationship between 'SanDisk' and 'Nasdaq'.
Options: stock exchange, founded by, headquarters location, member of