Utilize the input text as a context reference, choose the right relationship between 'Reliance Communications' and 'MUMBAI' from the options.
Options: chief executive officer, distributed by, headquarters location, owner of

MUMBAI (Reuters) - Mobile telecoms operator Reliance Communications Ltd will partner conglomerate Reliance Industries Ltd's telecoms unit to trade and share mobile airwaves and offer high-speed 4G services.
headquarters location