Utilize the input text as a context reference, choose the right relationship between '888 Holdings' and 'gambling' from the options.
Options: creator, chief executive officer, founded by, industry

(Reuters) - Online gambling firm 888 Holdings (888.L) stepped up a billion pound battle for Bwin.party Digital Entertainment (BPTY.L) on Tuesday, submitting a revised takeover proposal as it looks to see off rival interest from GVC Holdings (GVC.L).
industry