Utilize the input text as a context reference, choose the right relationship between 'Equinix' and 'data center' from the options.
Options: creator, manufacturer, product/material produced, parent organization

Earlier this year, $14.7 billion cap Equinix received its formal IRS REIT approval, eclipsing $9.4 billion Digital Realty Trust, Inc. (NYSE: DLR ) as the largest publicly traded data center REIT, calculated by market cap.
product/material produced