(a)    In any prosecution or abatement action under this article, it shall be an affirmative defense that the property owner has evicted or is diligently attempting to evict all tenants and occupants of the property that committed each alleged nuisance activity that caused the property to become a chronic nuisance property.

    (b)    In any prosecution or abatement action under this article, it shall be an affirmative defense that the property owner has diligently pursued reasonable means to avoid a recurrence of violations similar to the alleged nuisance activities that caused the property to become a chronic nuisance property.