In the 2013 Shelby County v. Holder case, the Supreme Court held that: a. the methods used to determine whether a state or local government should be subject to preclearance were obsolete. b. it was unconstitutional for any state to alter the voting procedures or district boundaries under any circumstance. c. the national government is not allowed to sue state and local governments after new procedures or district boundaries are put in place. d. when taxes are collected by one level of government, they must always be spent by another level. e. whenever Congress passes a law that preempts a certain area, the states are obligated to comply with the requirements of that law