Identify the true statements regarding alpha-1,6 linkages in glycogen.

• The number of sites for enzyme action on a glycogen molecules is increased through alpha-1,6 linkages.
• New alpha-1,6 linkages can only form if the branch has a free reducing end.
• The reaction that forms alpha-1,6 linkages is catalyzed by a branching enzyme.
• These linkages can only be formed on a chain that is exactly 11 residues long.
• Branching increases glycogen solubility.