Utilize the input text as a context reference, choose the right relationship between 'Vodafone' and 'Vodacom Tanzania' from the options.
Options: platform, location of formation, subsidiary, legal form

British telco Vodafone -- which owns a 40 per cent stake at Safaricom and a further 82.2 per cent in Vodacom Tanzania -- said the continued growth of mobile money is attributed to the fact that it services consumers at the bottom of the pyramid who cannot access banking services.
subsidiary