2. The court shall order that the parental responsibility for a minor child be shared by both parents unless the court finds that shared parental responsibility would be detrimental to the child....
a. In ordering shared parental responsibility, the court may consider the expressed desires of the parents and may grant to one party the ultimate responsibility over specific aspects of the child’s welfare or may divide those responsibilities between the parties based on the best interests of the child. Areas of responsibility may include education, health care, and any other responsibilities that the court finds unique to a particular family.
b. The court shall order sole parental responsibility for a minor child to one parent, with or without time-sharing with the other parent if it is in the best interests of the minor child.