How sequences of events occur to activate protein kinase a, Biology

When glucagon binds to it's receptor on a liver cell, which one of the following sequences of events occurs to activate protein kinase A?

-activation of G protein, activation of adenlatecylase, product of cAMP

-production of cAMP, activation of adenylatecylase, activation of G protein

-activation of adenylatecylase, activation of G protein, production of cAMP

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