Consider the Diagram at Right, Which Shows Glutamatergic Neurons

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Consider the diagram at right, which shows glutamatergic neurons. What does it mean that Synapses 1 and 3 become paired via LTP?

a) The combined activity at synapses 1 and 3 sufficiently depolarized Neuron D to cause LTP to occur
b) After pairing, a weak stimulus at synapse 1 will lead to a stronger response than before pairing
c) Synapses 1 and 3 have been physically changed by events that require gene transcription
d) all of the above