63. How does glucokinase (hexokinase IV) differ from hexokinase I? (A) It has a higher affinity for glucose and is not inhibited by high glucose levels. (B) It enables the liver to export free glucose into the bloodstream when blood glucose drops. (C) It needs a higher glucose concentration to reach maximal activity. (D) It helps prevent the liver from competing with other tissues for glucose when glucose levels are high. (E) It allows the pancreas to trigger insulin release when blood glucose levels are low.