The absolute refractory period of an action potential A. only ensures one-way travel down an axon. B. only allows a neuron to ignore a second signal sent that closely follows the first. C. only prevents summation of action potentials within the axon D. ensures one-way travel down an axon and allows a neuron to ignore a second signal sent that closely follows the first E. ensures one-way travel down an axon, allows a neuron to ignore a second signal sent that closely follows the first, and prevents summation of action potentials within the axon

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