Take context from the input text and decide on the accurate relationship between 'Worldpay' and 'London' from the options provided.
Options: headquarters location, parent organization, founded by, original broadcaster

British payments processor Worldpay joined the London Stock Exchange on Tuesday in an initial public offering valuing the company at 4.8 billion pounds ($7.4 billion), the biggest flotation in what had been a lacklustre year for listings in Britain.
headquarters location