Both insulin and glucagon are peptide hormones that target liver cells. The response of the target cells to each of these two hormones is opposite. This information implies that
◦ each of the two hormones uses a different second messenger.
◦ one hormone binds to a receptor on the cell membrane and the other to an intracellular receptor.
◦ the two hormones bind to different cell surface receptors.
◦ both hormones interact with receptors at the cell nucleus.
◦ A and C.