Which of the following will, for sure, without question, stimulate an action potential in a postsynaptic neuron?
a. Three IPSPs and two EPSPs occurring at once, near one another, near the trigger zone
b. Seven EPSPs, occurring repeatedly near the trigger zone
c. Three rapidly occurring EPSPs at the same spot, far from the trigger zone
d. Four IPSPs occurring at once near the trigger zone
e. The information given is not sufficient to answer the question.