Take context from the input text and decide on the accurate relationship between 'Inmarsat' and 'London' from the options provided.
Options: distributed by, location of formation, headquarters location, legal form

Inmarsat (LSE: ISAT.L - news ) ’s shares were rocketing in London alongside the launch of its third Global Xpress satellite, which went into orbit yesterday to help complete the firm’s next-generation broadband internet network.
headquarters location