The diagram below shows the second-messenger model of hormone action (such as adrenaline or glucagon) on a target liver cell.

Which of the following rows correctly identifies labels WWW, XXX, YYY, and ZZZ?
WWW: Protein kinase; XXX: ATP; YYY: Cyclic AMP; ZZZ: Adenylate cyclase
WWW: Adenylate cyclase; XXX: Cyclic AMP; YYY: ATP; ZZZ: Protein kinase
WWW: Adenylate cyclase; XXX: ATP; YYY: Cyclic AMP; ZZZ: Protein kinase
WWW: Protein kinase; XXX: Cyclic AMP; YYY: ATP; ZZZ: Adenylate cyclase