Synaptic integration means (Multiple Choice)

Synaptic integration means
  a. all positive or excitatory stimuli are added together.
  b. the positive and negative ions neutralize each other.
  c. excitatory and inhibitory signals are combined in a neuron.
  d. the adjacent neurons interact so that excitatory and inhibitory stimuli cancel each other
  out.
  e. that an interneuron is involved.

Question 2

An excitatory postsynaptic potential
  a. is only one of several types of graded potential.
  b. has a hyperpolarizing effect.
  c. will drive the membrane away from its threshold.
  d. is summed with an inhibitory postsynaptic potential at the input zone of a neuron in a
  process known as synaptic integration.
  e. help keep the membrane at resting membrane potential.