What is the relationship between 'FreeCharge' and 'e-commerce' in the context of the input sentence.
Options: stock exchange, legal form, industry, chairperson

Other Articles SC dismisses ONGC plea to reconsider arbitration venue Snapdeal, FreeCharge launch digital wallet Suvidhaa buys AasaanPay’s mobile platform After hundreds of e-commerce companies catering to individual buyers opened up in India in the last five years, the firms are looking at the business-to-business (B2B) online commerce space.
industry