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.
Refer to the input text as context and select the correct relationship between 'Xstrata' and 'Glencore' from the available options.
Options: owner of, operator, currency, owned by