In the context of the input sentence, determine the relationship between 'Equinix' and 'data center'.
Options: member of, product/material produced, employer, distributed by

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