What is the correct definition of the term aerobic exercise?

a.
the ability to handle the physical work and play of everyday life without becoming tired.

b.
rhythmic, nonstop, moderate-to-vigorous activity that requires large amounts of oxygen and works the heart.

c.
a type of activity that requires little oxygen and short bursts of energy.

d.
the measure of how effectively your heart and lungs work during physical activity or exercise.