Selected Choice label with its probability distribution and confidence.
choice is one of the labels supplied in Choice.criteria. probabilities
keeps the complete distribution, keyed by label, so applications can use a
confidence measure or risk policy different from the provider's.
confidence is the certainty from 0 to 1 in the selected label. Each
provider documents how it derives it; choose thresholds according to the
consequences of an incorrect automated decision.
ChoiceAnswer