Utilize the input text as a context reference, choose the right relationship between 'Xstrata' and 'Glencore' from the options.
Options: owned by, operator, currency, owner of

Klein brokered the talks between the bosses of Glencore Plc and Xstrata Plc that led to the $29 billion all-share takeover of the mining group by the commodity trader in 2013.
owned by