57. Proposed, final, and temporary regulations are binding (i.e., have the effect of law) on taxpayers. a. True b. False 58. All temporary regulations expire three years after issuance. a. True b. False 59. Legislative regulations may be challenged using the Chevron standard. a. True b. False 60. A regulation may not be made effective retroactively, because that would constitute an ex post facto law. a. True b. False