Analyze the relationship between 'Equinix' and 'data center' within the context of the input sentence.
Options: creator, manufacturer, parent organization, product/material produced

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