In glycogenolysis, the enzyme which transfers a trisaccharide unit from one branch to the other exposing 1→ 6 branch point is?

A) Phosphorylase B) α-[1→ 4]→ α-[1→ 4]→ Glucan transferase C) Amylo [1→ 6] glucosidase D) Amylo[1→ 4]→ [1→ 6] transglucosidase