NEW YORK--(BUSINESS WIRE)--Fitch Ratings affirms the SLM Student Loan Trust 2002-1 subordinate notes at \'AAAsf\' and both the SLM Student Loan Trust 2002-4 senior and subordinate notes at \'AAAsf\'. The Rating Outlook for all of the classes remains Stable. KEY RATING DRIVERS High Collateral Quality: Both SLM 2002-1 and SLM 2002-4 collateral consists of 100% Federal Family Education Loan Program (FFELP) loans. The credit quality of the trusts collateral is high, in Fitch\'s opinion, based on the gua
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