In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

Question: Insulin regulates the synthesis of fatty acids:
Options: <1> Activating phosphorylase <2> Dephosphorylating acetyl CoA carboxylase. <3> Inhibiting the formation of malonyl CoA. <4> Controlling the carnitine-acyl CoA transferase activity. <5> Activating the fatty acid synthetase.
2