Utilize the input text as a context reference, choose the right relationship between 'ComScore' and 'Rentrak' from the options.
Options: founded by, platform, owner of, product/material produced

NEW YORK (AP) -- Shares of ComScore soared more than 8 percent before the opening bell Wednesday on news that it would acquire Rentrak in an all-stock deal to create a larger ratings and media analysis company.
owner of