Take context from the input text and decide on the accurate relationship between 'Equinix' and 'data center' from the options provided.
Options: distributed by, product/material produced, member of, employer

Historically, Digital Realty has been a "wholesale" data center operator with a real estate focus, while Equinix has more technology DNA, as well as $7.5 billion of capital invested thus far to build out its interconnection focused "Platform Equinix."
product/material produced