Analyze the relationship between 'Equinix' and 'data center' within the context of the input sentence.
Options: headquarters location, currency, product/material produced, director/manager

-- U.S. data center operator Equinix (NasdaqGS: EQIX - news ) to acquire British peer Telecity Group (LSE: TCY.L - news ) (notified Sept. 24/deadline Oct. 29)
product/material produced