Which Statement Is True About the Absolute Refractory Period

Multiple Choice

Which statement is true about the absolute refractory period?

A) It ensures that action potentials move in only one direction along a nerve fiber.
B) It is the period when the membrane can undergo another action potential, but only if the stimulus is strong enough.
C) It is the time during an action potential when voltage-gated Na+ channels are in their "closed but capable of opening" conformation.
D) places a lower limit on the frequency with which a neuron can conduct action potentials.
E) All of the above statements are true.