From the Reading, "What is a Corporate Rating?" which of the following statements are correct? Select one: O a At the upper end of the ratings spectrum, the AAA-rating represents the highest quality, highest return investments O b. A credit rating can refer to a specific financial obligation or to the firm's general creditworthiness OC A credit ratings are assigned to domestic U.S. companies, states and local government units but not to foreign financial entities Od Two of the above statements are correct. Oe. All of the above statements are correct