What is the relationship between 'Mattel' and 'Barbie' in the context of the input sentence.
Options: location of formation, owner of, member of, product/material produced

The downside reflects sluggish economic conditions and lack of innovative schemes for brand awareness and brand innovation, which have been dampening point of sale (POS) momentum.Also, sluggish performance of Barbie has been a matter of concern for Mattel since the beginning of 2013.
owner of