question: Q:If a psychologist acts as both a fact witness for the plaintiff and an expert witness for the court in a criminal trial, she has acted:? 
  A:unethically by accepting dual roles.;B:ethically as long as she did not have a prior relationship with the plaintiff.;C:ethically as long as she clarifies her roles with all parties.;D:ethically as long as she obtains a waiver from the court.