Refer to the input text as context and select the correct relationship between 'Bertelsmann' and 'RTL Group' from the available options.
Options: owned by, chairperson, 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