( A ) Impulse transmission across an electrical synapse is always slower than that across a chemical synapse.
( B ) Electrical current can flow directly from one neuron into the other across electrical synapses.
( C ) At electrical synapses, the membranes of pre- and post-synaptic neurons are in very close proximity.
( D ) There are two types of synapses, namely, electrical synapses and chemical synapses.
