Help Seve & Ex Smith Company reported pretax book income of $420,000 Included in the computation were favorable temporary diferences of $54,000, unfavorable t of $22.000, and favorable permanent differences of $42,000 Smith's deferred income tax expense or benefit would be Multiple Choice Net deferred tax benefit of $15,960 Net deferred tax expense of $6.,720 Net deferred tax benefit of $6720 Net deferred tax expense of $15,960