Which of these are money market securities? I. Jumbo CDs Il Short-term municipal debt II U.S. Treasury bills IV. Commercial paper O Iand IV only Il and Ill only O I. I, and IV only O II.II, and IV only O L. II, lI., and IV Which characteristic generally applies to commercial paper? O Issued only by financial institutions O Issued only by corporations O Maturities limited to 90 days or less O Unsecured Secured by accounts receivable The optimal credit policy of any firm will: O maximize sales. O minimize bad debts. O maximize units sold. O minimize the total costs of granting credit. O minimize carrying costs