What is the relationship between 'YPF' and 'BUENOS AIRES' in the context of the input sentence.
Options: chairperson, parent organization, headquarters location, founded by

BUENOS AIRES Aug 18 Argentina's state-run energy firm YPF will pay about $122 million for stakes in two locally based petrochemical companies as part of its growth strategy to add value to locally produced crude oil, the company said on Tuesday.
headquarters location