On appeal, the appellant cited three errors of law made by the trial court. Which below is not one of them? a. Whether the defendant must respect downstream riparian rights

even though it had been granted an impoundment certificate by the Environmental Management Commission O b. Whether a municipal water authority has the power of eminent domain O c. Whether the plaintiff's were required to exhaust administrative remedies before bringing the Ilaw suit O d. Whether the correct measure of compensation for the taking is the reduction in amount of electricity generated by the plaintiffs