Presynaptic facilitation ____________.
a) does not incorporate the use of serotonin
b) is activity at an axoaxonal synapse that increases the amount of neurotransmitter released when an action potential arrives at the synaptic terminal
c) can be caused by preventing calcium channels from opening at the synaptic terminal
d) is the release of an inhibitory neurotransmitter at an axoaxonal junction that limits the release of neurotransmitter when an action potential arrives at the synaptic terminal