What does the Student Loan Marketing Association commonly known as Sallie Mae, not engage in?

The Student Loan Marketing Association, commonly known as Sallie Mae, initially focused on promoting and providing student loans. While it has a history of involvement in the education finance sector, it is not primarily engaged in issuing mortgage-backed securities. Sallie Mae's core operations revolve around student loans, which includes issuing federal and private loans, managing student loan programs, and conducting related activities such as private loan collections.

The company was instrumental in helping students finance their education through loans rather than engaging in the mortgage market, which involves different financial products and regulatory considerations. Therefore, option B accurately reflects what Sallie Mae does not focus on, as its mission has been more aligned with education-related financing rather than real estate securities.