Analyze the relationship between 'partypoker' and 'online poker' within the context of the input sentence.
Options: industry, owner of, distributed by, employer

In June, the first ever WPT online poker open on the partypoker U.S. Network became the first WPT real money online gaming events to take place in the United States since the Unlawful Internet Gambling Enforcement Act was adopted in 2006.
industry