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19. A trust officer at the Blacksburg National Bank needs to determine how to invest $100,000 in the following collection of bonds to maximize the annual return. Bond Annual Return A B D E 9.5% 8.0% 9.0% 9.0% 9.0% Maturity Long Short Long Long Short Risk High Low Low High High Tax-Free Yes Yes No Yes No The officer wants to invest at least 50% of the money in short-term issues and no more than 50% in high-risk issues. At least 30% of the funds should go into tax-free investments and at least 40% of the total annual return should be tax-free