Which of the following processes will accompany the actions of the neurotransmitter in her chemical synapses?

A patient with a diagnosis of depression has been prescribed a medication that ultimately increases the levels of the neurotransmitter serotonin between neurons. Which of the following processes will accompany the actions of the neurotransmitter in her chemical synapses? (Points : 0.4)
Two-way communication between neurons is permitted, in contrast to the one-way communication in electrical synapses.
Communication between a neuron and the single neuron it is connected with will be facilitated.
The neurotransmitter will cross gap junctions more readily.
More serotonin molecules will cross the synaptic cleft and bond with postsynaptic receptors.