In the Case of Conducting Evaluation in Child Custody Disagreements

In the case of conducting evaluation in child custody disagreements, which of the following is the most desirable relationship between the psychologist who will conduct the evaluation and all others involved in the process (child and parents) ?

A) If the family has been in therapy together, their current psychologist should conduct an evaluation.
B) If the child has been in therapy, his psychologist should conduct the evaluation.
C) A psychologist who does not know any of the family members should conduct the evaluation.
D) A psychologist who does not have a current therapeutic relationship with any of the family members, but who will begin one after the case is resolved, should conduct the evaluation.