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Sorting by two keys with a stable sort

You want orders sorted by city, and within each city by amount. You choose to call sort twice. In which order, and why does it work?

A.City first, then amount, because the last sort winsB.Either order, because both keys are usedC.Amount first, then city, because the sort is stableD.Neither; two sorts always lose the first order

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Sorting by two keys with a stable sort

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