Refer to the input text as context and select the correct relationship between 'Betfair' and 'online gambling' from the available options.
Options: industry, distributed by, location of formation, platform

DUBLIN - Betfair and Irish rival Paddy Power have reached agreement on a 6 billion pound ($9.2 billion)combination, first set out last month and designed to secure leadership of Britain's competitive online gambling market.
industry