When Expert Evidence Is Presented to a Judge, Under the Dauber

When expert evidence is presented to a judge, under the Dauber decision the judge acts as a "gatekeeper"

A) to try to exclude "junk" science from coming into evidence
B) but does not have to be concerned with junk science because the witness is a true expert
C) in order to "frye" an expert who seems overly confident about his or her conclusions
D) in order to make sure the witness is fully confident about his or her testimony