单选题 An investor in the 28% tax bracket is considering buying one of the following securities: A fully taxable Treasury security offering a 6.0% yield. A municipal bond offered at par offering a 4.0% yield. What is the after-tax yield on the Treasury and the taxable-equivalent yield on the municipal bond? After-tax yield on the treasury Taxable-equivalent yield on the municipal A. 4.32% 2.88% B. 4.32% 5.56% C. 6.48% 2.88%