All of the Following Statements Concerning Glycogen Synthase Are True

All of the following statements concerning glycogen synthase are true EXCEPT which one?

A) The D and I forms of the enzyme are interconvertible through phosphorylation and dephosphorylation.
B) The D form depends upon high intracellular levels of glucose 6-phosphate in order to be active.
C) In skeletal muscle, increased intracellular levels of glycogen inhibits the conversion of the D form to the I form.
D) High intracellular levels of ATP can stimulate glycogen synthase D activity.
E) None of the above; they are all true.