The hierarchy between Australian Courts of Law serves a number of purposes. Which of the following is one of the purposes of having a hierarchical court structure? That is, which one of the following statements is true? Select one: a. A hierarchy of courts provides for higher courts to rehear cases from rich parties that can afford to relitigate them. b. A hierarchy of courts provides a system of appeals through which dissatisfied litigants may have the same matter retried a few times to ensure consistency. c. A hierarchy of courts is instrumental in making sure equitable rules modify harsher common law or statutory law. d. A hierarchy of courts ensures that the decision of most courts can be reviewed or overturned by a higher court