Refer to the input text as context and select the correct relationship between 'DESFA' and 'gas' from the available options.
Options: business division, chief executive officer, product/material produced, creator

-- SOCAR, Azerbaijan's state energy company, to buy stakes in Greek natural gas grid operator DESFA from Greek natural gas utility DEPA (notified Oct. 1/deadline suspended on Jan. 21)
product/material produced