Answer:
The correct answer is "nonreducing".
Explanation:
The enzymes that catalyze glycogen expansion are specific for the nonreducing ends. These enzymes are known as glycosyltransferases, and Glycogenin is the most widely used. Glycogenin adds glucose specifically to the nonreducing ends of glycogen, and since glycogen have many nonreducing ends multiple residues of glucose are added in this process.