59. In the communication link between a motor neuron and a skeletal muscle, which of the following descriptions is right? (A) The motor neuron is considered the presynaptic cell and the skeletal muscle is the postsynaptic cell. (B) The motor neuron is considered the postsynaptic cell and the skeletal muscle is the presynaptic cell. (C) Action potentials are possible on the motor neuron but not the skeletal muscle. (D) Action potentials are possible on the skeletal muscle but not the motor neuron. (E) The motor neuron fires action potentials but the skeletal muscle is not electrochemically excitable,