Which Statements Describe the Function of the Central Nervous System

Which statements describe the function of the central nervous system synapse?
Select all that apply.

A) Suppression,or inhibition,of the firing of neurons
B) Inhibition of the release of a neurotransmitter
C) Release of an inhibitory neurotransmitter that suppresses conduction
D) Simulation,or activation,of the firing of neurons
E) Serving as the primary functioning cell within the nervous system