Utilize the input text as a context reference, choose the right relationship between 'Equinix' and 'data center' from the options.
Options: product/material produced, employer, member of, 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