NEW YORK--(BUSINESS WIRE)--Fitch Ratings affirms the long- and short-term ratings of the Minnesota Office of Higher Education's supplemental student loan program revenue bonds, 2012 series A (taxable) and series B (tax-exempt). A full rating list is provided at the end of this release. KEY RATING DRIVERS The ratings are based on the support provided by a direct-pay letter of credit (LOC) issued by Royal Bank of Canada providing full support to the bonds. Royal Bank of Canada is obligated to mak