Utilize the input text as a context reference, choose the right relationship between 'RTL Group' and 'Bertelsmann' from the options.
Options: distribution format, owned by, distributed by, stock exchange

Bertelsmann also holds the majority of broadcaster RTL Group (Other OTC: RGLXF - news ) , which last week lifted its full-year sales forecast after regaining market share in its core German TV business.
owned by