Take context from the input text and decide on the accurate relationship between 'Equinix' and 'data center' from the options provided.
Options: parent organization, product/material produced, creator, manufacturer

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