20. Which of the following statements correctly describes the role of hormones in the coordinated regulation of glycolysis and gluconeogenesis in liver? (A) Glucagon stimulates glycolysis and inhibits gluconeogenesis. (B) Insulin stimulates gluconeogenesis and inhibits glycolysis. (C) Glucagon decreases the levels of fructose-2,6-bisphosphate and inhibits glycolysis. (D) Insulin increases the levels of fructose-2,6-bisphosphate and inhibits glycolysis. (E) Epinephrine inhibits both glycolysis and gluconeogenesis.