You are studying how a hormone affects a cell and find that when oxytocin binds the receptor, the intracellular $Ca$$^2$$^+$ concentration increases. Based on this information, what could you logically conclude about this cell and hormone?

• A. The cell uses adenylate cyclase as a second messenger.
• B. Oxytocin directly interacts with the DNA of the cell.
• C. The cell uses $IP_3$ and DAG as secondary messengers.
• D. Both A & B are correct.