In exercising muscle, glycogen degradation supplies the muscle with glucose‑6‑phosphate. in order to stimulate muscle glycogen degradation, protein phosphatase 1 (pp1) must be inhibited. four of the five events are involved in the inactivation of pp1 in exercising muscle. which event is not involved?

a. epinephrine initiates a signal transduction cascade that utilizes protein kinase a.

b. phosphorylated pp1 inhibitor binds to pp1, facilitating glycogen degradation by phosphorylase a.

c. protein kinase a phosphorylates gm in the gm-pp1 complex, resulting in its dissociation.

d. insulin initiates a protein kinase cascade that utilizes glycogen synthase kinase.

e. protein kinase a phosphorylates an inhibitor of pp1.