In the context of the input sentence, determine the relationship between 'Mattel' and 'Barbie'.
Options: employer, creator, owner of, owned by

Bratz's return is well-timed, after Barbie has already taken a knocking from the flyaway success of Disney's Frozen-related merchandise, which recently transferred its licensing rights from Mattel to Hasbro (NasdaqGS: HAS - news ) as of 2016.
owner of