Signal transduction pathways

You are studying the effects of three new neuropeptide drugs in culture. You find that drug A causes a short-term increase in a K⁺ current. Drug B causes a short-term increase in a Cl^– current. Adding drugs A and B together results in a long-term increase in the number of Ca⁺⁺ channels in addition to the effect that each drug has on its own. Adding drug C results only in a short-term increase in the Na⁺ current. Assume that each drug affects a different receptor and that no receptor directly binds to more than one drug.

PLEASE DRAW (not just verbally explain) possible signal transduction pathways that could account for the effects of drugs A, B, and C (Note that there are many possible pathways that could work here.)