Sept 29 (Reuters) - Data analytics provider ComScore Inc said it would buy viewership rating company Rentrak Corp in an all-stock deal with an implied value of about $771 million to create a comprehensive measurement system for media and ad industries.
Utilize the input text as a context reference, choose the right relationship between 'ComScore' and 'Rentrak' from the options.
Options: legal form, developer, owner of, original broadcaster