Refer to the input text as context and select the correct relationship between 'GMC' and 'General Motors' from the available options.
Options: operator, owned by, owner of, location of formation

Fold in the Silverado's upscale twin, the GMC Sierra, and General Motors ( NYSE:GM ) sold more full-size pickups in the first half of 2015 than mighty Ford ( NYSE:F ) .
owned by