Take context from the input text and decide on the accurate relationship between 'Covestro' and 'Bayer' from the options provided.
Options: employer, owned by, distributed by, chairperson

Fri, Sep 4, 2015, 11:05 BST - UK Markets close in 5 hrs 25 mins Bayer says Covestro unit to go public in Q4 AFP – 28 minutes ago View Photo
owned by