What Happens to an Action Potential at an Excitatory Synapse

Multiple Choice

What happens to an action potential at an excitatory synapse

A) The postsynaptic neuron depolarizes the presynaptic cell membrane.
B) The presynaptic neuron increases the permeability of the subsynaptic membrane of the postsynaptic cell to both Na⁺ and K⁺.
C) The presynaptic neuron increases the permeability of the subsynaptic membrane of the postsynaptic cell to K⁺ only.
D) A small hyperpolarization occurs.