Utilize the input text as a context reference, choose the right relationship between 'G4S' and 'LONDON' from the options.
Options: developer, distribution format, headquarters location, founded by

LONDON (Reuters) - Britain's G4S Plc (GFS.L) said it won a $187 million contract to provide security services to a gas plant in Iraq, while in Afghanistan, it renewed a contract to provide protection to the British government.
headquarters location