Cyclic AMP,CREB,and protein kinase A are all in the same pathway.What is the correct sequence of these molecules in that pathway (from earliest to latest)?

A) Cyclic AMP,CREB,protein kinase A
B) Cyclic AMP,protein kinase A,CREB
C) CREB,cyclic AMP,protein kinase A
D) CREB,protein kinase A,cyclic AMP
E) Protein kinase A,CREB,cyclic AMP