What is the relationship between 'Inmarsat' and 'London' in the context of the input sentence.
Options: stock exchange, developer, platform, headquarters location

5,855.00p +2.92% Smiths Group (Other OTC: SMGKF - news ) (SMIN) 1,129.00p +2.54% FTSE 100 - Fallers Mondi (MNDI) 1,409.00p -4.67% Inmarsat (LSE: ISAT.L - news ) (ISAT) 1,001.00p -1.96% London Stock Exchange Group (LSE) 2,425.00p -1.86% Aviva (Amsterdam: AW8.AS - news ) (AV.)
headquarters location