Headquartered in London, Worldpay was carved out of RBS (LSE: RBS.L - news ) five years ago and established as a standalone business by private equity firms Advent International and Bain Capital - who paid £1.7bn for the business.
In the context of the input sentence, determine the relationship between 'Worldpay' and 'Bain Capital'.
Options: employer, parent organization, currency, chairperson