Norma is in the 32% marginal tax bracket.Because of her high tax rate, Norma would like to reinvest a $10,000, 6%, certificate of deposit in a tax-exempt bond.What is the minimum rate of interest Norma would have to receive to make the tax exempt-bond a more profitable investment?() A、4.10% B、6.00% C、8.40% D、9.00%