In the context of the input sentence, determine the relationship between 'Whitbread' and 'Costa Coffee'.
Options: parent organization, currency, subsidiary, founded by

Several firms, including clothing retailer Next (Other OTC: NXGPF - news ) , Costa Coffee and Premier Inns owner Whitbread (LSE: WTB.L - news ) and pub chain Wetherspoon's have all complained about the higher costs stemming from the government's wage policy.
subsidiary