What Is the Most Important Underlying Principle of Custody Agreements

What is the most important underlying principle of custody agreements?

A) That the children are spending enough time with each parent to maintain close bonds with each parent
B) That the children are spending enough time with each parent to determine who is the worst parent
C) That the parents have equal time with the children to avoid paying child support
D) That the parents are spending enough time with the children to determine if the children are being brainwashed by the other parent