With no explanation, chose the best option from "A", "B", "C" or "D". required custody be awarded to Richard. We disagree. The GAL’s 31 page report was entered into evidence without objection by either party. Included in the report was a summary of the interviews conducted, and an assessment of each of the factors enumerated in NDCC § 14-09-06.2. Colleen’s argument that the report was “flawed and erroneous” goes to the weight of the evidence and not its admissibility. See Haus v. Haus, 479 N.W.2d 474, 476 (N.D.1992) (appellant attacked weight to be given testimony of witnesses). In bench trials, the credibility of witnesses and the weight to be given their testimony are both exclusively functions of the trial court. Schmidt v. Schmidt, 325 N.W.2d 230, 233 (N.D.1982); N.D.R.Civ.P. Rule 52(a); see also Johnson v. Johnson, 480 N.W.2d 433, 437-38 (N.D.1992) (<HOLDING>). The amount of weight and credibility the

A: recognizing that admission is important to the evaluation of witness credibility
B: recognizing trial courts ability to ascertain the demeanor and credibility of expert witness
C: holding total deference is given to the trial courts determination of historical facts supported by the record especially when the trial courts findings turn on evaluating a witnesss credibility and demeanor
D: recognizing that courts give special deference to the agencys eyewitness observations of demeanor
B.