Having transformed Glencore from a poorly understood commodities trader based in Baar into one of the world's largest resources companies through the spectacular $US60 billion float four years ago and the takeover of mining group Xstrata in 2013, the hard-nosed South African was lauded as a savvy deal maker.
Utilize the input text as a context reference, choose the right relationship between 'Xstrata' and 'Glencore' from the options.
Options: operator, owned by, stock exchange, owner of