Utilize the input text as a context reference, choose the right relationship between '3i Infrastructure' and 'Investment' from the options.
Options: creator, member of, currency, industry

COPENHAGEN, July 7 (Reuters) - Investment firms 3i Infrastructure and AMP Capital have agreed to buy Danish shipping company Esvagt for 4.1 billion Danish crowns ($607 million), aiming to tap growing demand for servicing offshore wind farms.
industry