Which of the following would block synaptic transmission at an inhibitory GABA synapse?
A) by blocking voltage-gated Ca2+ channels
B) by injecting Ca2+ into the synaptic terminal of the presynaptic neuron
C) by injecting a Ca2+ chelator into the postsynaptic neuron
D) by blocking IP3 gated Ca2+ channels with cadmium
E) More than one of the above