Resting potential is to action potential as is to

Polarization, depolarization

Explanation:

Resting potential is to action potential as polarization is to depolarization.

This type of potential is telling us about what is happening when a neuron is resting. On the other side, an action potential is happening when a neuron is sending information to an axon and because of that, a stimulus is causing the resting potential which is happening when a neuron is at rest.