What description matches the alternative fitness principle of recovery?

Consistently helps keep you motivated and your body in motion.
A workout program must progress in its level of difficulty in order for the body to continue improving.
A hard day of intense exercising should be followed by an easier day with a lighter workout.
In order for a fitness program to be fully effective, exercises that address all fitness components must be incorporated on a regular basis.

A hard day of intense exercising should be followed by an easier day with a lighter workout.