Glycogen synthase is activated by _________ and inactivated by _________, whereas glycogen phosphorylase is activated by _________ and inactivated by _________.
a-dephosphorylation, dephosphorylation; phosphorylation; phosphorylation
b-phosphorylation, dephosphorylation; dephosphorylation; phosphorylation
c-phosphorylation, dephosphorylation; phosphorylation; dephosphorylation
d-dephosphorylation, phosphorylation; phosphorylation; dephosphorylation