Utilize the input text as a context reference, choose the right relationship between 'Bertelsmann' and 'RTL Group' from the options.
Options: chairperson, owned by, owner of, product/material produced

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.
owner of