Analyze the relationship between 'Rubicon Project' and 'LOS ANGELES' within the context of the input sentence.
Options: developer, location of formation, brand, business division

LOS ANGELES & LONDON--(BUSINESSWIRE)-- Launch of Argentina and Hungary Advertising Co-Ops Expands Rubicon Project Leadership Role as The Exclusive Publisher Co-operative Marketplace Serving More Than 290 Premium Publishers Globally
location of formation