What is/are characteristic(s) of EPSPs and IPSPs?

What is/are characteristic(s) of EPSPs and IPSPs?
  a. EPSPs and IPSPs do not influence action potentials.
  b. EPSPs and IPSPs are graded potentials.
  c. EPSPs and IPSPs occur via an all-or-none response.
  d. EPSPs are fast action potentials; IPSPs are slow action potentials.
  e. EPSPs occur in myelinated axons; IPSPs occur in unmyelinated axons.

Question 2

An excitatory postsynaptic potential (EPSP):
  a. results in partial depolarization of the neuron.
  b. always causes a neuron to fire.
  c. prevents a neuron from firing.
  d. results in partial hyperpolarization of the neuron.
  e. changes the action potential threshold level.