What is the relationship between Reliance Infrastructure and Mumbai in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Reliance Infra: Anil Ambani -led Reliance Infrastructure (RInfra) on Wednesday reported 12.39 per cent decline in net profit for the quarter ended June 30 at Rs 400.91 crore mainly due to losses incurred by its cement and Mumbai metro businesses in spite of an increase in revenues.

Answer: headquarters_location