Utilize the input text as a context reference, choose the right relationship between 'DESFA' and 'DEPA' from the options.
Options: employer, stock exchange, owned by, distributed by

-- SOCAR, Azerbaijan's state energy company, to buy stakes in Greek natural gas grid operator DESFA from Greek natural gas utility DEPA (notified Oct (HKSE: 3366-OL.HK - news ) .
owned by