NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the long- and short-term ratings for the Minnesota Office of Higher Education's supplemental student loan program revenue bonds 2008 series A (taxable) and B (tax-exempt). The ratings will expire on the earliest to occur of: (1) Oct. 1, 2017, which is the stated expiration date of the letter of credit, unless such date is extended; (2) any prior termination of the letter of credit; or (3) defeasance of the bonds. KEY RATING DRIVERS The ratin