The structural basis of presynaptic inhibition is
A.
Axon-axon synapse and axon-dendritic synapse
B.
Axon-cell body synapse and axon-cell body synapse
C.
Axon-axon synapse and axon-cell synapse
D.
Axon-dendritic synapse and axon-dendritic synapse
E.
Axon-axon synapse and axon-axon synapse