It is settled law that questions of fact and assessment of credibility are reviewable on a reasonableness standard. Reasonableness is concerned mostly with the existence of justification, transparency, and intelligibility within the decision-making process. But it is also concerned with whether the decision falls within a range of possible, acceptable outcomes which are defensible in respect of the facts and law (Dunsmuir v. New Brunswick, 2008 SCC 9,  1 S.C.R. 190, at para. 47).
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