Mostly A, and a little of D. The term heuristic has positive connotations to me, since it brings to mind Polya and related ideas more than it does cognitive bias. I know that many cognitive biases are a result of heuristics being applied inappropriately, but I think of that more in terms of our abusing heuristics (which are still great) than there being some inherent problem or negative aspect of the heuristics themselves.