Joan, a neuroscience graduate student, is asked by her laboratory mentor to study the communication ...

Joan, a neuroscience graduate student, is asked by her laboratory mentor to study the communication of two neurons grown in a petri dish. She is asked to stimulate an action potential in the first neuron, which will send a depolarizing stimulus to the second, receiving neuron. However, her mentor would also like her to block the receiving neuron from generating an action potential. How can Joan accomplish this?
 
  a. She must cause the depolarization current in the receiving neuron to drift to the junction where the cell body and the axon meet.
  b. She must block the process of summation in the receiving neuron.
  c. She must cause the first neuron to release excitatory neurotransmitters.
  d. She must remove the myelin from the receiving neuron.