What is the relationship between 'RadioShack' and 'trade' in the context of the input sentence.
Options: member of, owned by, industry, currency

The SEC said Jaspen and Supranonok used contracts-for-differences, which are derivatives allowing for leveraged stock price bets, to trade from 2010 to 2015 in Panera Bread Co, RadioShack Corp (Other OTC: RSHCQ - news ) and other companies based on press releases stolen from the three newswires.
industry