What type of loan is a Sallie Mae Signature Student Loan? These are the choices I have to choose from Loan Types and Their Codes) : B Guaranteed Student Loans (GSL) C Federal Insured Student Loans (FISL) G Unsubsidized Federal Stafford Loans (including Nonsubsidized Stafford Loans) H Federal Supplemental Loans for Students (SLS) L Direct Unsubsidized Loans M National Direct Student Loans (NDSL) P Auxiliary Loans to Assist Students (ALAS) Z Loans for Disadvantaged Students (LDS)